Remove SkShader.Empty from CanvasKit

SkShaders::Empty may be easy to expose, but that doesn't mean we should.
It shouldn't even be public, but Chrome uses it in one place.

Change-Id: I398a5e6f782990a7baec0d9b1d0018f7456ff15f
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/260956
Reviewed-by: Kevin Lubick <kjlubick@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>

Author: brianosman

modules/canvaskit/CHANGELOG.md

@@ -9,6 +9,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Fixed
  - `CanvasKit.SaveLayerInitWithPrevious` and `CanvasKit.SaveLayerF16ColorType` constants.
 
+### Removed
+- `SkShader.Empty`
+
 ## [0.10.0] - 2019-12-09
 
 ### Added

modules/canvaskit/canvaskit_bindings.cpp

@@ -1342,7 +1342,6 @@ EMSCRIPTEN_BINDINGS(Skia) {
             return SkShaders::Blend(mode, dst, src, &m);
         }))
         .class_function("Color", select_overload<sk_sp<SkShader>(SkColor)>(&SkShaders::Color))
-        .class_function("Empty", &SkShaders::Empty)
         .class_function("_Lerp", optional_override([](float t, sk_sp<SkShader> dst, sk_sp<SkShader> src)->sk_sp<SkShader> {
             return SkShaders::Lerp(t, dst, src, nullptr);
         }))