Move the rest of the renderer->browser messages that belong in content. Also do a bunch of cleanup:

content/common/child_thread.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/common/child_thread.h"
 
 #include "base/message_loop.h"
 #include "base/string_util.h"
 #include "base/command_line.h"
 #include "content/common/child_process.h"
@@ skipping 41 matching lines @@
 
   resource_dispatcher_.reset(new ResourceDispatcher(this));
   socket_stream_dispatcher_.reset(new SocketStreamDispatcher());
   file_system_dispatcher_.reset(new FileSystemDispatcher());
 
   sync_message_filter_ =
       new IPC::SyncMessageFilter(ChildProcess::current()->GetShutDownEvent());
   channel_->AddFilter(sync_message_filter_.get());
 
 #if !defined(NACL_WIN64)
-  // Currently, the NaCl 64 DLL build requires a lot of extra dependencies to
-  // support IPC messages with parameters, so until there's a need for trace in
-  // NaCl, this is reserved for non-NaCl builds.
+  // This brings in a depenency on gpu, which isn't linked in with NaCl's win64
+  // build.
   channel_->AddFilter(new ChildTraceMessageFilter());
 #endif
 
   // When running in unit tests, there is already a NotificationService object.
   // Since only one can exist at a time per thread, check first.
   if (!NotificationService::current())
     notification_service_.reset(new NotificationService);
 }
 
 ChildThread::~ChildThread() {
@@ skipping 127 matching lines @@
     MessageLoop::current()->Quit();
     return;
   }
 
   // The child process shutdown sequence is a request response based mechanism,
   // where we send out an initial feeler request to the child process host
   // instance in the browser to verify if it's ok to shutdown the child process.
   // The browser then sends back a response if it's ok to shutdown.
   Send(new ChildProcessHostMsg_ShutdownRequest);
 }