Migrate content/ files to histogram_macros.h includes.

content/renderer/p2p/ipc_socket_factory.cc

 // 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.
 
 #include "content/renderer/p2p/ipc_socket_factory.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <list>
 
 #include "base/compiler_specific.h"
 #include "base/logging.h"
 #include "base/macros.h"
 #include "base/metrics/field_trial.h"
-#include "base/metrics/histogram.h"
+#include "base/metrics/histogram_macros.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/stringprintf.h"
 #include "base/threading/non_thread_safe.h"
 #include "base/threading/thread_checker.h"
 #include "base/trace_event/trace_event.h"
 #include "content/renderer/media/webrtc_logging.h"
 #include "content/renderer/p2p/host_address_request.h"
 #include "content/renderer/p2p/socket_client_delegate.h"
 #include "content/renderer/p2p/socket_client_impl.h"
 #include "content/renderer/p2p/socket_dispatcher.h"
@@ skipping 777 matching lines @@
 }
 
 rtc::AsyncResolverInterface*
 IpcPacketSocketFactory::CreateAsyncResolver() {
   std::unique_ptr<AsyncAddressResolverImpl> resolver(
       new AsyncAddressResolverImpl(socket_dispatcher_));
   return resolver.release();
 }
 
 }  // namespace content