Revert " Roll src/third_party/dart b37aa3b...1eb113b (#9559)"

This reverts commit 140b2ae.

Author: a-siva

DEPS

@@ -34,7 +34,7 @@ vars = {
   # Dart is: https://github.com/dart-lang/sdk/blob/master/DEPS.
   # You can use //tools/dart/create_updated_flutter_deps.py to produce
   # updated revision list of existing dependencies.
-  'dart_revision': '1eb113ba27c42fe4da80825624f5ab9fc2c2ce53',
+  'dart_revision': '7340a569caac6431d8698dc3788579b57ffcf0c6',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py
@@ -63,7 +63,7 @@ vars = {
   'dart_http_throttle_tag': '1.0.2',
   'dart_intl_tag': '0.15.7',
   'dart_json_rpc_2_tag': '2.0.9',
-  'dart_linter_tag': '0.1.92',
+  'dart_linter_tag': '0.1.91',
   'dart_logging_tag': '0.11.3+2',
   'dart_markdown_tag': '2.0.3',
   'dart_matcher_tag': '0.12.3',
@@ -75,7 +75,7 @@ vars = {
   'dart_package_config_tag': '1.0.5',
   'dart_package_resolver_tag': '1.0.10',
   'dart_path_tag': '1.6.2',
-  'dart_pedantic_tag': 'v1.7.0',
+  'dart_pedantic_tag': 'v1.5.0',
   'dart_pool_tag': '1.3.6',
   'dart_protobuf_rev': '7d34c9e4e552a4f66acce32e4344ae27756a1949',
   'dart_pub_rev': 'ecd5b413271f2699f8cd9e23aa4eebb5030c964f',
@@ -364,7 +364,7 @@ deps = {
    Var('dart_git') + '/package_resolver.git' + '@' + Var('dart_package_resolver_tag'),
 
   'src/third_party/dart/tools/sdks':
-   {'packages': [{'version': 'version:2.3.3-dev.0.0', 'package': 'dart/dart-sdk/${{platform}}'}], 'dep_type': 'cipd'},
+   {'packages': [{'version': 'version:2.3.0', 'package': 'dart/dart-sdk/${{platform}}'}], 'dep_type': 'cipd'},
 
   # WARNING: end of dart dependencies list that is cleaned up automatically - see create_updated_flutter_deps.py.