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

content/child/child_message_filter.cc

 // Copyright 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/child_message_filter.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/location.h"
 #include "base/task_runner.h"
-#include "content/child/child_thread.h"
+#include "content/child/child_thread_impl.h"
 #include "content/child/thread_safe_sender.h"
 #include "ipc/message_filter.h"
 
 namespace content {
 
 class ChildMessageFilter::Internal : public IPC::MessageFilter {
  public:
   explicit Internal(ChildMessageFilter* filter) : filter_(filter) {}
 
   bool OnMessageReceived(const IPC::Message& msg) override {
@@ skipping 23 matching lines @@
   return thread_safe_sender_->Send(message);
 }
 
 base::TaskRunner* ChildMessageFilter::OverrideTaskRunnerForMessage(
     const IPC::Message& msg) {
   return NULL;
 }
 
 ChildMessageFilter::ChildMessageFilter()
     : internal_(NULL),
-      thread_safe_sender_(ChildThread::current()->thread_safe_sender()) {}
+      thread_safe_sender_(ChildThreadImpl::current()->thread_safe_sender()) {}
 
 ChildMessageFilter::~ChildMessageFilter() {}
 
 IPC::MessageFilter* ChildMessageFilter::GetFilter() {
   if (!internal_)
     internal_ = new Internal(this);
   return internal_;
 }
 
 }  // namespace content