[Impeller] removed old blur detritus (flutter#51779)

[C++, Objective-C, Java style guides]: https://github.com/flutter/engine/blob/main/CONTRIBUTING.md#style

Author: gaaclarke

ci/licenses_golden/licenses_flutter

@@ -40037,11 +40037,8 @@ ORIGIN: ../../../flutter/impeller/entity/shaders/conical_gradient_fill.frag + ..
 ORIGIN: ../../../flutter/impeller/entity/shaders/conical_gradient_ssbo_fill.frag + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/impeller/entity/shaders/debug/checkerboard.frag + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/impeller/entity/shaders/debug/checkerboard.vert + ../../../flutter/LICENSE
-ORIGIN: ../../../flutter/impeller/entity/shaders/gaussian_blur/gaussian_blur.glsl + ../../../flutter/LICENSE
-ORIGIN: ../../../flutter/impeller/entity/shaders/gaussian_blur/gaussian_blur.vert + ../../../flutter/LICENSE
-ORIGIN: ../../../flutter/impeller/entity/shaders/gaussian_blur/gaussian_blur_noalpha_decal.frag + ../../../flutter/LICENSE
-ORIGIN: ../../../flutter/impeller/entity/shaders/gaussian_blur/gaussian_blur_noalpha_nodecal.frag + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/impeller/entity/shaders/gaussian_blur/kernel.glsl + ../../../flutter/LICENSE
+ORIGIN: ../../../flutter/impeller/entity/shaders/gaussian_blur/kernel.vert + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/impeller/entity/shaders/gaussian_blur/kernel_decal.frag + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/impeller/entity/shaders/gaussian_blur/kernel_nodecal.frag + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/impeller/entity/shaders/geometry/points.comp + ../../../flutter/LICENSE
@@ -42916,11 +42913,8 @@ FILE: ../../../flutter/impeller/entity/shaders/conical_gradient_fill.frag
 FILE: ../../../flutter/impeller/entity/shaders/conical_gradient_ssbo_fill.frag
 FILE: ../../../flutter/impeller/entity/shaders/debug/checkerboard.frag
 FILE: ../../../flutter/impeller/entity/shaders/debug/checkerboard.vert
-FILE: ../../../flutter/impeller/entity/shaders/gaussian_blur/gaussian_blur.glsl
-FILE: ../../../flutter/impeller/entity/shaders/gaussian_blur/gaussian_blur.vert
-FILE: ../../../flutter/impeller/entity/shaders/gaussian_blur/gaussian_blur_noalpha_decal.frag
-FILE: ../../../flutter/impeller/entity/shaders/gaussian_blur/gaussian_blur_noalpha_nodecal.frag
 FILE: ../../../flutter/impeller/entity/shaders/gaussian_blur/kernel.glsl
+FILE: ../../../flutter/impeller/entity/shaders/gaussian_blur/kernel.vert
 FILE: ../../../flutter/impeller/entity/shaders/gaussian_blur/kernel_decal.frag
 FILE: ../../../flutter/impeller/entity/shaders/gaussian_blur/kernel_nodecal.frag
 FILE: ../../../flutter/impeller/entity/shaders/geometry/points.comp

impeller/entity/BUILD.gn

@@ -25,11 +25,9 @@ impeller_shaders("entity_shaders") {
     "shaders/color_matrix_color_filter.frag",
     "shaders/color_matrix_color_filter.vert",
     "shaders/conical_gradient_fill.frag",
-    "shaders/gaussian_blur/gaussian_blur.vert",
-    "shaders/gaussian_blur/gaussian_blur_noalpha_decal.frag",
-    "shaders/gaussian_blur/gaussian_blur_noalpha_nodecal.frag",
     "shaders/gaussian_blur/kernel_decal.frag",
     "shaders/gaussian_blur/kernel_nodecal.frag",
+    "shaders/gaussian_blur/kernel.vert",
     "shaders/glyph_atlas.frag",
     "shaders/glyph_atlas_color.frag",
     "shaders/glyph_atlas.vert",

impeller/entity/contents/content_context.cc

@@ -405,10 +405,6 @@ ContentContext::ContentContext(
   texture_strict_src_pipelines_.CreateDefault(*context_, options);
   position_uv_pipelines_.CreateDefault(*context_, options);
   tiled_texture_pipelines_.CreateDefault(*context_, options);
-  gaussian_blur_noalpha_decal_pipelines_.CreateDefault(*context_,
-                                                       options_trianglestrip);
-  gaussian_blur_noalpha_nodecal_pipelines_.CreateDefault(*context_,
-                                                         options_trianglestrip);
   kernel_decal_pipelines_.CreateDefault(*context_, options_trianglestrip);
   kernel_nodecal_pipelines_.CreateDefault(*context_, options_trianglestrip);
   border_mask_blur_pipelines_.CreateDefault(*context_, options_trianglestrip);

impeller/entity/contents/content_context.h

@@ -67,9 +67,7 @@
 #include "impeller/entity/yuv_to_rgb_filter.frag.h"
 #include "impeller/entity/yuv_to_rgb_filter.vert.h"
 
-#include "impeller/entity/gaussian_blur.vert.h"
-#include "impeller/entity/gaussian_blur_noalpha_decal.frag.h"
-#include "impeller/entity/gaussian_blur_noalpha_nodecal.frag.h"
+#include "impeller/entity/kernel.vert.h"
 #include "impeller/entity/kernel_decal.frag.h"
 #include "impeller/entity/kernel_nodecal.frag.h"
 
@@ -139,16 +137,10 @@ using PositionUVPipeline =
     RenderPipelineT<TextureFillVertexShader, TiledTextureFillFragmentShader>;
 using TiledTexturePipeline =
     RenderPipelineT<TextureFillVertexShader, TiledTextureFillFragmentShader>;
-using GaussianBlurDecalPipeline =
-    RenderPipelineT<GaussianBlurVertexShader,
-                    GaussianBlurNoalphaDecalFragmentShader>;
-using GaussianBlurPipeline =
-    RenderPipelineT<GaussianBlurVertexShader,
-                    GaussianBlurNoalphaNodecalFragmentShader>;
 using KernelDecalPipeline =
-    RenderPipelineT<GaussianBlurVertexShader, KernelDecalFragmentShader>;
+    RenderPipelineT<KernelVertexShader, KernelDecalFragmentShader>;
 using KernelPipeline =
-    RenderPipelineT<GaussianBlurVertexShader, KernelNodecalFragmentShader>;
+    RenderPipelineT<KernelVertexShader, KernelNodecalFragmentShader>;
 using BorderMaskBlurPipeline =
     RenderPipelineT<BorderMaskBlurVertexShader, BorderMaskBlurFragmentShader>;
 using MorphologyFilterPipeline =
@@ -523,16 +515,6 @@ class ContentContext {
     return GetPipeline(tiled_texture_pipelines_, opts);
   }
 
-  std::shared_ptr<Pipeline<PipelineDescriptor>> GetGaussianBlurDecalPipeline(
-      ContentContextOptions opts) const {
-    return GetPipeline(gaussian_blur_noalpha_decal_pipelines_, opts);
-  }
-
-  std::shared_ptr<Pipeline<PipelineDescriptor>> GetGaussianBlurPipeline(
-      ContentContextOptions opts) const {
-    return GetPipeline(gaussian_blur_noalpha_nodecal_pipelines_, opts);
-  }
-
   std::shared_ptr<Pipeline<PipelineDescriptor>> GetKernelDecalPipeline(
       ContentContextOptions opts) const {
     return GetPipeline(kernel_decal_pipelines_, opts);
@@ -977,10 +959,6 @@ class ContentContext {
 #endif  // IMPELLER_ENABLE_OPENGLES
   mutable Variants<PositionUVPipeline> position_uv_pipelines_;
   mutable Variants<TiledTexturePipeline> tiled_texture_pipelines_;
-  mutable Variants<GaussianBlurDecalPipeline>
-      gaussian_blur_noalpha_decal_pipelines_;
-  mutable Variants<GaussianBlurPipeline>
-      gaussian_blur_noalpha_nodecal_pipelines_;
   mutable Variants<KernelDecalPipeline> kernel_decal_pipelines_;
   mutable Variants<KernelPipeline> kernel_nodecal_pipelines_;
   mutable Variants<BorderMaskBlurPipeline> border_mask_blur_pipelines_;