Roll src/third_party/dart fd48ea3432..a873bc5db3 (7 commits)

dart-lang/sdk@a873bc5db3 fix extension constructor error
dart-lang/sdk@6061906a77 split endMethod into 6 separate events
dart-lang/sdk@6a8b75ff8d [vm/fuzzer] Call each generated method once
dart-lang/sdk@6191db939f Send arguments for dart developer timeline events
dart-lang/sdk@6c38345818 [vm/fuzzer] Add FFI calls to C library
dart-lang/sdk@a2e9af92d2 Protocol for 'server.log' notification.
dart-lang/sdk@7e7369cd98 [vm, bytecode] Don't write Bytecode::var_descriptors_ in snapshots.

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': 'fd48ea3432aaeec5467b87f5192e9cc56f2b945e',
+  'dart_revision': 'a873bc5db36f68dfa69a2b6ec762ae591b56c252',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py

ci/licenses_golden/licenses_third_party

-Signature: f52f7c65ec79034b2042cf6fa927074e
+Signature: fce6d5c82855c75228e1292d55d0ffcf
 
 UNUSED LICENSES:
 
@@ -7438,6 +7438,7 @@ FILE: ../../../third_party/dart/runtime/llvm_codegen/bit/main.cc
 FILE: ../../../third_party/dart/runtime/llvm_codegen/bit/test.cc
 FILE: ../../../third_party/dart/runtime/llvm_codegen/codegen/main.cc
 FILE: ../../../third_party/dart/runtime/tools/dartfuzz/dartfuzz_api_table.dart
+FILE: ../../../third_party/dart/runtime/tools/dartfuzz/dartfuzz_ffiapi.dart
 FILE: ../../../third_party/dart/runtime/tools/dartfuzz/gen_api_table.dart
 FILE: ../../../third_party/dart/runtime/tools/graphexplorer/graphexplorer.html
 FILE: ../../../third_party/dart/runtime/tools/graphexplorer/graphexplorer.js