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

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

+// Copyright (c) 2015, 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.
+
+library stack_trace.unparsed_frame;
+
+import 'frame.dart';
+
+/// A frame that failed to parse.
+///
+/// The [member] property contains the original frame's contents.
+class UnparsedFrame implements Frame {
+  final Uri uri = new Uri(path: "unparsed");
+  final int line = null;
+  final int column = null;
+  final bool isCore = false;
+  final String library = "unparsed";
+  final String package = null;
+  final String location = "unparsed";
+
+  final String member;
+
+  UnparsedFrame(this.member);
+
+  String toString() => member;
+}