Stop running pub get at gclient sync time and fix build bugs

mojo/public/dart/third_party/stack_trace/lib/stack_trace.dart

Index: mojo/public/dart/third_party/stack_trace/lib/stack_trace.dart
diff --git a/mojo/public/dart/third_party/stack_trace/lib/stack_trace.dart b/mojo/public/dart/third_party/stack_trace/lib/stack_trace.dart
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+// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+/**
+ * Stack trace generation and parsing.
+ *
+ * ## Installing ##
+ *
+ * Use [pub][] to install this package. Add the following to your `pubspec.yaml`
+ * file.
+ *
+ *     dependencies:
+ *       stack_trace: any
+ *
+ * Then run `pub install`.
+ *
+ * For more information, see the
+ * [stack_trace package on pub.dartlang.org][pkg].
+ *
+ * [pub]: http://pub.dartlang.org
+ * [pkg]: http://pub.dartlang.org/packages/stack_trace
+ */
+library stack_trace;
+
+export 'src/chain.dart';
+export 'src/frame.dart';
+export 'src/trace.dart';
+export 'src/unparsed_frame.dart';