Unify the three places that patch font loading for PDFium on Windows.

content/child/thread_safe_sender.cc

 // Copyright (c) 2013 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/child/thread_safe_sender.h"
 
 #include "base/message_loop/message_loop_proxy.h"
-#include "content/child/child_thread.h"
+#include "content/child/child_thread_impl.h"
 #include "ipc/ipc_sync_message_filter.h"
 
 namespace content {
 
 ThreadSafeSender::ThreadSafeSender(
     const scoped_refptr<base::MessageLoopProxy>& main_loop,
     const scoped_refptr<IPC::SyncMessageFilter>& sync_filter)
     : main_loop_(main_loop), sync_filter_(sync_filter) {
 }
 
 ThreadSafeSender::~ThreadSafeSender() {
 }
 
 bool ThreadSafeSender::Send(IPC::Message* msg) {
   if (main_loop_->BelongsToCurrentThread())
-    return ChildThread::current()->Send(msg);
+    return ChildThreadImpl::current()->Send(msg);
   return sync_filter_->Send(msg);
 }
 
 }  // namespace content