Roll dart in engine to version 1aaebedd7045a44ba92bb1bb27c3a8bc25d74856 (#4721)

DEPS

@@ -31,7 +31,7 @@ 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': '0b4f01f7593c8c42a77dc27d1fc234c95eacc88e',
+  'dart_revision': '1aaebedd7045a44ba92bb1bb27c3a8bc25d74856',
 
   'dart_args_tag': '0.13.7',
   'dart_async_tag': '2.0.4',

travis/licenses_golden/licenses_third_party

-Signature: ea8a5adcf8a823cfb2c960d0bab0ac0f
+Signature: 090869981061784e1c33cafa6307eeaa
 
 UNUSED LICENSES:
 
@@ -4611,6 +4611,7 @@ FILE: ../../../third_party/dart/sdk/lib/_internal/js_runtime/lib/js_number.dart
 FILE: ../../../third_party/dart/sdk/lib/_internal/js_runtime/lib/js_string.dart
 FILE: ../../../third_party/dart/sdk/lib/_internal/js_runtime/lib/math_patch.dart
 FILE: ../../../third_party/dart/sdk/lib/_internal/js_runtime/lib/mirrors_patch.dart
+FILE: ../../../third_party/dart/sdk/lib/_internal/js_runtime/lib/mirrors_patch_cfe.dart
 FILE: ../../../third_party/dart/sdk/lib/_internal/js_runtime/lib/native_helper.dart
 FILE: ../../../third_party/dart/sdk/lib/_internal/js_runtime/lib/regexp_helper.dart
 FILE: ../../../third_party/dart/sdk/lib/_internal/js_runtime/lib/string_helper.dart
@@ -5359,8 +5360,9 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 ====================================================================================================
 LIBRARY: dart
-ORIGIN: ../../../third_party/dart/sdk/lib/typed_data/unmodifiable_typed_data.dart + ../../../third_party/dart/LICENSE
+ORIGIN: ../../../third_party/dart/runtime/vm/finalizable_data.h + ../../../third_party/dart/LICENSE
 TYPE: LicenseType.bsd
+FILE: ../../../third_party/dart/runtime/vm/finalizable_data.h
 FILE: ../../../third_party/dart/sdk/lib/typed_data/unmodifiable_typed_data.dart
 ----------------------------------------------------------------------------------------------------
 Copyright (c) 2018, the Dart project authors.  Please see the AUTHORS file