Attempt four at landing the "histogram.h removed from message_loop.h" patch.

base/message_loop_proxy_impl_unittest.cc

 // Copyright (c) 2010 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/message_loop.h"
 #include "base/message_loop_proxy_impl.h"
+#include "base/scoped_ptr.h"
 #include "base/thread.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "testing/platform_test.h"
 
 
 class MessageLoopProxyImplTest : public testing::Test {
  public:
   void Release() {
     AssertOnIOThread();
     Quit();
@@ skipping 105 matching lines @@
         new base::Thread("MessageLoopProxyImplTest_Dummy"));
     test_thread->Start();
     message_loop_proxy = test_thread->message_loop_proxy();
   }
   bool deleted = false;
   bool ret = message_loop_proxy->PostTask(FROM_HERE, new DummyTask(&deleted));
   EXPECT_FALSE(ret);
   EXPECT_TRUE(deleted);
 }