Manual roll of Dart 03e4737...cb6ed67 (flutter#20138)

dart-lang/sdk@03e4737f31 bulk fix for `prefer_contains`
dart-lang/sdk@d983751b77 [dart2js] Refactor a few methods for type masks
dart-lang/sdk@fbe33e8123 `avoid_init_to_null` bulk fix
dart-lang/sdk@58a6e3c478 Rewrite handling of ignore comments to use token structure rather than regex
dart-lang/sdk@4a268b764c Support const subclasses of visitor classes (issue 42853)
dart-lang/sdk@9b96337521 [co19] LibTests/async tests enabled in status files
dart-lang/sdk@355cade14f Add experiment flag for Value Classes
dart-lang/sdk@459769185c Roll benchmarks-internal 0e59a6bc3ee9..171db4d6bcd4
dart-lang/sdk@d19617f513 [infra] Remove ABI builder from the test matrix
dart-lang/sdk@251c3d7d42 [cfe] Allow nullable arguments to super==
dart-lang/sdk@125f9e3ae8 [infra] Increase shards for co19 tests on VM AOT NNBD builder
dart-lang/sdk@fffd0d04b1 [cfe] Handle Null/Never-ish spread element types
dart-lang/sdk@77fcb33bd0 [cfe] Update local function return type inference
dart-lang/sdk@4c210e8b98 [cfe] Infer Null from implicit return in function literal type inference
dart-lang/sdk@45173623e2 [cfe] Add test for issue 42459
dart-lang/sdk@6ca00d12c0 [VM] Adds Future.wait support for --lazy-async-stacks.
dart-lang/sdk@d878cfbf20 [dart:io] Introduce per-domain policy for strict secure connections.
dart-lang/sdk@3a821631fb [vm] Fail gracefully when background compilation runs out of memory.
dart-lang/sdk@b9205ddc0c Allow null safety for convert, crypto, csslib
dart-lang/sdk@57a8ffd6b1 [ddc] Fix `is` type tests on nullable types
dart-lang/sdk@d159c8283d [observatory] Run dartfmt.
dart-lang/sdk@3f01c3e588 [vm] Handle all typed data element types in various C APIs.
dart-lang/sdk@68472f2767 Fix add_missing_required_argument to handle named constructors
dart-lang/sdk@de0848e7ea Analyzer: Move tests out of old test file into diagonstics.
dart-lang/sdk@49d7eba24e Reland "[ VM ] Print a meaningful error message when a user attempts to run an AOT snapshot with a JIT VM."
dart-lang/sdk@61a6eb4246 Bump dartdoc to ~0.32.3
dart-lang/sdk@f64d6dbb4f Move and refactor LUB tests.
dart-lang/sdk@c2559967b5 [ DartDev ] Print error to console when trying to launch a missing SDK artifact (e.g., snapshots)
dart-lang/sdk@91d460176a [vm/service] Avoid exposing top-level class ids in the service protocol
dart-lang/sdk@101ad6549a Bump markdown to ~2.1.6
dart-lang/sdk@61a944ca6a [vm/compiler] Align BoxInt64 implementation on x64 with arm/arm64 by calling a shared slow path

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': 'cb6ed67a7316e4173f3fd882c73c353d0533a3db',
+  'dart_revision': '03e4737f31151663badde83c5514389f8587efff',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py
@@ -198,7 +198,7 @@ deps = {
    Var('dart_git') + '/dart2js_info.git' + '@' + Var('dart_dart2js_info_tag'),
 
   'src/third_party/dart/third_party/pkg/dartdoc':
-   Var('dart_git') + '/dartdoc.git@v0.32.2',
+   Var('dart_git') + '/dartdoc.git@6d5396c2b4bc415ab9cb3d8212b87ecffd90a272',
 
   'src/third_party/dart/third_party/pkg/ffi':
    Var('dart_git') + '/ffi.git@454ab0f9ea6bd06942a983238d8a6818b1357edb',
@@ -240,7 +240,7 @@ deps = {
    Var('dart_git') + '/logging.git@9561ba016ae607747ae69b846c0e10958ca58ed4',
 
   'src/third_party/dart/third_party/pkg/markdown':
-   Var('dart_git') + '/markdown.git@dd150bb64c5f3b41d31f20f399ae2a855f7f8c00',
+   Var('dart_git') + '/markdown.git@acaddfe74217f62498b5cf0cf5429efa6a700be3',
 
   'src/third_party/dart/third_party/pkg/matcher':
    Var('dart_git') + '/matcher.git@9cae8faa7868bf3a88a7ba45eb0bd128e66ac515',

ci/licenses_golden/licenses_third_party

@@ -1,4 +1,4 @@
-Signature: 7f5f1317ad0cdf579afba6e695998e8e
+Signature: 0485f6b15a488eabf7ad0b32fbd1b040
 
 UNUSED LICENSES:
 
@@ -8384,6 +8384,7 @@ FILE: ../../../third_party/dart/sdk/lib/_http/embedder_config.dart
 FILE: ../../../third_party/dart/sdk/lib/_internal/js_dev_runtime/patch/js_patch.dart
 FILE: ../../../third_party/dart/sdk/lib/_internal/js_runtime/lib/js_patch.dart
 FILE: ../../../third_party/dart/sdk/lib/_internal/vm/lib/ffi_struct_patch.dart
+FILE: ../../../third_party/dart/sdk/lib/io/network_policy.dart
 ----------------------------------------------------------------------------------------------------
 Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
 for details. All rights reserved.