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

mojo/public/dart/third_party/analyzer/lib/src/string_source.dart

+// 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.
+
+library analyzer.string_source;
+
+import 'generated/engine.dart' show TimestampedData;
+import 'generated/source.dart';
+
+/// An implementation of [Source] that's based on an in-memory Dart string.
+class StringSource extends Source {
+  final String _contents;
+  final String fullName;
+  final int modificationStamp;
+
+  StringSource(this._contents, this.fullName)
+      : modificationStamp = new DateTime.now().millisecondsSinceEpoch;
+
+  TimestampedData<String> get contents =>
+      new TimestampedData(modificationStamp, _contents);
+
+  String get encoding =>
+      throw new UnsupportedError("StringSource doesn't support " "encoding.");
+
+  int get hashCode => _contents.hashCode ^ fullName.hashCode;
+
+  bool get isInSystemLibrary => false;
+
+  String get shortName => fullName;
+
+  @override
+  Uri get uri =>
+      throw new UnsupportedError("StringSource doesn't support uri.");
+
+  UriKind get uriKind =>
+      throw new UnsupportedError("StringSource doesn't support " "uriKind.");
+
+  bool operator ==(Object object) {
+    if (object is StringSource) {
+      StringSource ssObject = object;
+      return ssObject._contents == _contents && ssObject.fullName == fullName;
+    }
+    return false;
+  }
+
+  bool exists() => true;
+
+  Uri resolveRelativeUri(Uri relativeUri) => throw new UnsupportedError(
+      "StringSource doesn't support resolveRelative.");
+}