Use base::MessageLoop in more files.

extensions/common/one_shot_event_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 "extensions/common/one_shot_event.h"
 
 #include "base/bind.h"
 #include "base/run_loop.h"
 #include "base/test/test_simple_task_runner.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 40 matching lines @@
   EXPECT_EQ(1U, runner->GetPendingTasks().size());
   EXPECT_EQ(0, i);
   runner->RunPendingTasks();
   EXPECT_EQ(1, i);
 }
 
 TEST(OneShotEventTest, PostDefaultsToCurrentMessageLoop) {
   OneShotEvent event;
   scoped_refptr<base::TestSimpleTaskRunner> runner(
       new base::TestSimpleTaskRunner);
-  MessageLoop loop;
+  base::MessageLoop loop;
   int runner_i = 0;
   int loop_i = 0;
 
   event.Post(FROM_HERE, base::Bind(&Increment, &runner_i), runner);
   event.Post(FROM_HERE, base::Bind(&Increment, &loop_i));
   event.Signal();
   EXPECT_EQ(1U, runner->GetPendingTasks().size());
   EXPECT_EQ(0, runner_i);
   runner->RunPendingTasks();
   EXPECT_EQ(1, runner_i);
@@ skipping 30 matching lines @@
   EXPECT_EQ(1U, runner->GetPendingTasks().size());
   EXPECT_EQ(0, i);
   runner->RunPendingTasks();
   // Increment has run.
   EXPECT_EQ(0U, runner->GetPendingTasks().size());
   EXPECT_EQ(1, i);
 }
 
 }  // namespace
 }  // namespace extensions