Add ExecuteJavaScriptForTest and make all tests use it

chrome/browser/extensions/api/media_galleries/media_galleries_watch_apitest.cc

 // 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.
 //
 // MediaGalleries gallery watch API browser tests.
 
 #include "base/files/file_path.h"
 #include "base/files/file_path_watcher.h"
 #include "base/files/file_util.h"
 #include "base/run_loop.h"
@@ skipping 90 matching lines @@
     ExtensionApiTest::TearDownOnMainThread();
   }
 
   bool GalleryWatchesSupported() {
     return base::FilePathWatcher::RecursiveWatchAvailable();
   }
 
   void ExecuteCmdAndCheckReply(const std::string& js_command,
                                const std::string& ok_message) {
     ExtensionTestMessageListener listener(ok_message, false);
-    background_host_->GetMainFrame()->ExecuteJavaScript(
+    background_host_->GetMainFrame()->ExecuteJavaScriptForTests(
         base::ASCIIToUTF16(js_command));
     EXPECT_TRUE(listener.WaitUntilSatisfied());
   }
 
   bool AddNewFileInTestGallery() {
     base::FilePath gallery_file =
         test_gallery_.path().Append(FILE_PATH_LITERAL("test1.txt"));
     std::string content("new content");
     int write_size =
         base::WriteFile(gallery_file, content.c_str(), content.length());
@@ skipping 229 matching lines @@
   // Remove all gallery watchers.
   ExecuteCmdAndCheckReply(kRemoveAllGalleryWatchCmd, kRemoveAllGalleryWatchOK);
 
   // Gallery watchers removed. chrome.mediaGalleries.getAllGalleryWatch
   // should return an empty list.
   ExtensionTestMessageListener final_get_all_check_finished(
       kNoGalleryWatchesInstalled, false /* no reply */);
   ExecuteCmdAndCheckReply(kGetAllWatchedGalleryIdsCmd, kGetAllGalleryWatchOK);
   EXPECT_TRUE(final_get_all_check_finished.WaitUntilSatisfied());
 }