Roll src/third_party/dart ca7baa4013..4d5e15abde (29 commits)

dart-lang/sdk@4d5e15abde Fix broken static_extension_getter_setter_test.
dart-lang/sdk@cbdbb464ca [vm] Repair fingerprinting of recognized methods.
dart-lang/sdk@1e9a065dad [vm/fuzzer] Restrict depth of ... operator
dart-lang/sdk@a0fd607d10 [vm/fuzzer] add missing space
dart-lang/sdk@f3b2d770ad Migration: rework assignment handling.
dart-lang/sdk@1bbee6119d Migration: handle binary expressions whose LHS has type `dynamic`.
dart-lang/sdk@75fd88cf8c Migration: handle dynamic function expression invocations.
dart-lang/sdk@eeb1716660 Migration: don't forget to visit arguments to dynamic invocations.
dart-lang/sdk@3cccd7f117 Migration: handle `??=` assignments.
dart-lang/sdk@13ba681398 [vm/compiler] DIV/MOD magic for ARM64
dart-lang/sdk@03b195164b Revert "[vm, snapshot] Use data image pages for kFull snapshots."
dart-lang/sdk@5303538a09 [vm/fuzzer] re-enable control flow collections
dart-lang/sdk@9a9c0f3374 [test] Update status for some mirrors tests under reload stress testing.
dart-lang/sdk@6e01ad4d22 Fix for codeOffset/codeLength for enum constants.
dart-lang/sdk@3f7805a90e Make the NNBD command-line options less, uh, half-baked.
dart-lang/sdk@2305d9f3a6 [vm/compiler] Better be ready for OSR in field init
dart-lang/sdk@79137ed65f Migration: create flow anaylsis before visiting parameters.
dart-lang/sdk@1100aab88d Migration: handle `this` or `super` in generic classes.
dart-lang/sdk@d93d70a89a [dart2js] Add test for issue #38005.
dart-lang/sdk@64360e9f1a [vm/bytecode] Do not expect _ClosureCall in interpreted async stack traces.
dart-lang/sdk@f3911dffb5 Update included element kinds to include extensions
dart-lang/sdk@81dc269a71 Status file cleanup.
dart-lang/sdk@e82d1115ac Remove _CheckBuildStatus on commit
dart-lang/sdk@90866d3ecc Remove unused import
dart-lang/sdk@30ea777c65 fix parsing of "?.." cascade operator
dart-lang/sdk@13fc090e85 Fix language_2/map_literal3_test/03.
dart-lang/sdk@7ffb9de00f Update the version in the extension methods version hint
dart-lang/sdk@557f9121a5 Add canned_checks.CheckPatchFormatted to presubmit
dart-lang/sdk@004d49bd6b Make a fork of sdk/lib for use by NNBD.

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': 'ca7baa4013730abb8d233f4b4b48464d70d922a0',
+  'dart_revision': '4d5e15abde4a94421ce8d87c94a4250096b8de92',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py