Use a direct include of time headers in content/, part 1.

content/browser/histogram_synchronizer.h

 // Copyright (c) 2012 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.
 
 #ifndef CONTENT_BROWSER_HISTOGRAM_SYNCHRONIZER_H_
 #define CONTENT_BROWSER_HISTOGRAM_SYNCHRONIZER_H_
 
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/callback.h"
 #include "base/memory/singleton.h"
 #include "base/synchronization/lock.h"
-#include "base/time.h"
+#include "base/time/time.h"
 #include "content/browser/histogram_subscriber.h"
 
 namespace base {
 class MessageLoop;
 }
 
 namespace content {
 
 // This class maintains state that is used to upload histogram data from the
 // various child processes, into the browser process. Such transactions are
@@ skipping 119 matching lines @@
   // The sequence number used by the most recent asynchronous update request to
   // contact all processes.
   int async_sequence_number_;
 
   DISALLOW_COPY_AND_ASSIGN(HistogramSynchronizer);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_HISTOGRAM_SYNCHRONIZER_H_