Use base::MessageLoop in more files.

chrome/browser/ui/app_list/search/history_data_store_unittest.cc

 // Copyright 2013 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.
 
 #include "base/basictypes.h"
 #include "base/bind.h"
 #include "base/file_util.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/memory/ref_counted.h"
 #include "base/message_loop.h"
@@ skipping 73 matching lines @@
  private:
   void OnRead(scoped_ptr<HistoryData::Associations> associations) {
     associations_.clear();
     if (associations)
       associations->swap(associations_);
 
     if (run_loop_)
       run_loop_->Quit();
   }
 
-  MessageLoopForUI message_loop_;
+  base::MessageLoopForUI message_loop_;
   content::TestBrowserThread ui_thread_;
   base::ScopedTempDir temp_dir_;
   base::FilePath data_file_;
   scoped_ptr<base::RunLoop> run_loop_;
 
   scoped_refptr<HistoryDataStore> store_;
   HistoryData::Associations associations_;
 
   DISALLOW_COPY_AND_ASSIGN(HistoryDataStoreTest);
 };
@@ skipping 66 matching lines @@
   EXPECT_EQ(now, it->second.update_time);
 
   store()->Delete(kQuery);
   Flush();
   Load();
   EXPECT_TRUE(associations().empty());
 }
 
 }  // namespace test
 }  // namespace app_list