Use base::MessageLoop in more files.

chrome/browser/ui/app_list/search/history_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/memory/scoped_ptr.h"
 #include "base/message_loop.h"
 #include "base/run_loop.h"
 #include "base/stringprintf.h"
@@ skipping 140 matching lines @@
                ? (*known_results_.get())[result_id]
                : UNKNOWN_RESULT;
   }
 
   History* history() { return history_.get(); }
   const HistoryData::Associations& associations() const {
     return history_->data_->associations();
   }
 
  private:
-  MessageLoopForUI message_loop_;
+  base::MessageLoopForUI message_loop_;
   content::TestBrowserThread ui_thread_;
   scoped_ptr<TestingProfile> profile_;
 
   scoped_ptr<History> history_;
   scoped_ptr<KnownResults> known_results_;
 
   DISALLOW_COPY_AND_ASSIGN(SearchHistoryTest);
 };
 
 TEST_F(SearchHistoryTest, Persistence) {
@@ skipping 138 matching lines @@
 
   // The oldest secondary is gone.
   EXPECT_EQ(UNKNOWN_RESULT, GetResultType("1"));
 
   // Touched oldest survived.
   EXPECT_EQ(PERFECT_SECONDARY, GetResultType("0"));
 }
 
 }  // namespace test
 }  // namespace app_list