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

mojo/dart/embedder/builtin.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef MOJO_DART_EMBEDDER_BUILTIN_H_
 #define MOJO_DART_EMBEDDER_BUILTIN_H_
 
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 
 #include "base/macros.h"
-#include "dart/runtime/include/dart_api.h"
+#include "mojo/public/third_party/dart/runtime/include/dart_api.h"
 
 namespace mojo {
 namespace dart {
 
 #define REGISTER_FUNCTION(name, count)                                         \
   { "" #name, name, count },
 #define DECLARE_FUNCTION(name, count)                                          \
   extern void name(Dart_NativeArguments args);
 
 class Builtin {
@@ skipping 52 matching lines @@
   static const char* mojo_core_patch_resource_names_[];
   static const char* mojo_io_patch_resource_names_[];
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(Builtin);
 };
 
 }  // namespace dart
 }  // namespace mojo
 
 #endif  // MOJO_DART_EMBEDDER_BUILTIN_H_