Roll Dart SDK to 9994a0b (flutter#3381)

DEPS

@@ -27,7 +27,7 @@ vars = {
 
   # Note: When updating the Dart revision, ensure that all entries that are
   # dependencies of dart are also updated
-  'dart_revision': 'ed00447138f95ea4ba612509a244ca8205735372',
+  'dart_revision': '9994a0b44fce95e2012fabdea8d364cc71352e18',
   'dart_boringssl_gen_revision': '1a810313a0290e1caace9da73fa3ab89995ad2c7',
   'dart_boringssl_revision': 'd519bf6be0b447fb80fbc539d4bff4479b5482a2',
   'dart_observatory_packages_revision': '26aad88f1c1915d39bbcbff3cad589e2402fdcf1',

travis/licenses.golden

@@ -19975,7 +19975,6 @@ FILE: ../../../dart/runtime/observatory/lib/src/repositories/top_retaining_insta
 FILE: ../../../dart/runtime/observatory/lib/src/repositories/type_arguments.dart
 FILE: ../../../dart/runtime/observatory/web/timeline_message_handler.js
 FILE: ../../../dart/runtime/platform/utils_fuchsia.h
-FILE: ../../../dart/runtime/tools/kernel-service.dart
 FILE: ../../../dart/runtime/vm/assembler_dbc.cc
 FILE: ../../../dart/runtime/vm/assembler_dbc.h
 FILE: ../../../dart/runtime/vm/assembler_dbc_test.cc
@@ -20043,6 +20042,7 @@ FILE: ../../../dart/sdk/lib/developer/service.dart
 FILE: ../../../dart/sdk/lib/js_util/dart2js/js_util_dart2js.dart
 FILE: ../../../dart/sdk/lib/js_util/dartium/js_util_dartium.dart
 FILE: ../../../dart/sdk/lib/vmservice/devfs.dart
+FILE: ../../../dart/utils/kernel-service/kernel-service.dart
 ----------------------------------------------------------------------------------------------------
 Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 for details. All rights reserved. Use of this source code is governed by a
@@ -20315,6 +20315,7 @@ ORIGIN: ../../../dart/runtime/vm/malloc_hooks.cc + ../../../dart/LICENSE
 TYPE: LicenseType.bsd
 FILE: ../../../dart/runtime/vm/malloc_hooks.cc
 FILE: ../../../dart/runtime/vm/malloc_hooks.h
+FILE: ../../../dart/runtime/vm/malloc_hooks_test.cc
 FILE: ../../../dart/runtime/vm/malloc_hooks_unsupported.cc
 ----------------------------------------------------------------------------------------------------
 Copyright (c) 2017, the Dart project authors.  Please see the AUTHORS file
@@ -72163,4 +72164,4 @@ freely, subject to the following restrictions:
 3. This notice may not be removed or altered from any source distribution.
 ====================================================================================================
 Total license count: 693
-     31676 of 31676 ██████████ 100% (0 missing licenses)  Done.    
+     31677 of 31677 ██████████ 100% (0 missing licenses)  Done.