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

tonic/dart_script_loader_sync.h

 // Copyright 2015 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 TONIC_DART_SCRIPT_LOADER_SYNC_H_
 #define TONIC_DART_SCRIPT_LOADER_SYNC_H_
 
 #include <memory>
 #include <string>
 #include <unordered_map>
 #include <unordered_set>
 #include <vector>
 
 #include "base/callback_forward.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
-#include "dart/runtime/include/dart_api.h"
+#include "mojo/public/third_party/dart/runtime/include/dart_api.h"
 
 namespace tonic {
 
 class DartLibraryProvider;
 
 class DartScriptLoaderSync {
  public:
   // Blocks until |script_uri| and all of its dependencies have been loaded
   // into the current isolate.
   static void LoadScript(const std::string& script_uri,
                          DartLibraryProvider* library_provider);
 };
 
 }  // namespace tonic
 
 #endif  // TONIC_DART_SCRIPT_LOADER_SYNC_H_