Get rid of view_messages.h includes in chrome\renderer.

content/renderer/render_thread_impl.cc

 // Copyright (c) 2011 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/render_thread_impl.h"
 
 #include <algorithm>
 #include <limits>
 #include <map>
 #include <vector>
@@ skipping 347 matching lines @@
                                 IPC::Channel::Listener* listener) {
   widget_count_++;
   return ChildThread::AddRoute(routing_id, listener);
 }
 
 void RenderThreadImpl::RemoveRoute(int32 routing_id) {
   widget_count_--;
   return ChildThread::RemoveRoute(routing_id);
 }
 
+int RenderThreadImpl::GenerateRoutingID() {
+  int routing_id = MSG_ROUTING_NONE;
+  Send(new ViewHostMsg_GenerateRoutingID(&routing_id));
+  return routing_id;
+}
+
 void RenderThreadImpl::AddFilter(IPC::ChannelProxy::MessageFilter* filter) {
   channel()->AddFilter(filter);
 }
 
 void RenderThreadImpl::RemoveFilter(IPC::ChannelProxy::MessageFilter* filter) {
   channel()->RemoveFilter(filter);
 }
 
 void RenderThreadImpl::SetOutgoingMessageFilter(
     IPC::ChannelProxy::OutgoingMessageFilter* filter) {
@@ skipping 388 matching lines @@
 
 scoped_refptr<base::MessageLoopProxy>
 RenderThreadImpl::GetFileThreadMessageLoopProxy() {
   DCHECK(message_loop() == MessageLoop::current());
   if (!file_thread_.get()) {
     file_thread_.reset(new base::Thread("Renderer::FILE"));
     file_thread_->Start();
   }
   return file_thread_->message_loop_proxy();
 }