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

mojo/public/dart/third_party/charcode/lib/charcode.dart

Index: mojo/public/dart/third_party/charcode/lib/charcode.dart
diff --git a/mojo/public/dart/third_party/charcode/lib/charcode.dart b/mojo/public/dart/third_party/charcode/lib/charcode.dart
new file mode 100644
index 0000000000000000000000000000000000000000..a47fc194661a4dc3d55c622fb0fb7d76ac905b08
--- /dev/null
+++ b/mojo/public/dart/third_party/charcode/lib/charcode.dart
@@ -0,0 +1,19 @@
+// Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+/**
+ * Defines symbolic names for character code points.
+ *
+ * Includes all ASCII and Latin-1 characters.
+ *
+ * Exports the libraries `ascii.dart` and `html_entity.dart`.
+ *
+ * Hides the characters `$minus`, `$sub` and `$tilde` from
+ * `html_entities.dart`, since other characters have the same name in
+ * `ascii.dart`.
+ */
+library charcode;
+
+export "ascii.dart";
+export "html_entity.dart" hide $minus, $tilde, $sub;