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

content/plugin/plugin_thread.h

 // 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.
 
 #ifndef CONTENT_PLUGIN_PLUGIN_THREAD_H_
 #define CONTENT_PLUGIN_PLUGIN_THREAD_H_
 
 #include "base/files/file_path.h"
 #include "base/native_library.h"
 #include "build/build_config.h"
-#include "content/child/child_thread.h"
+#include "content/child/child_thread_impl.h"
 #include "content/child/npapi/plugin_lib.h"
 #include "content/plugin/plugin_channel.h"
 
 #if defined(OS_POSIX)
 #include "base/file_descriptor_posix.h"
 #endif
 
 namespace content {
 class BlinkPlatformImpl;
 
 // The PluginThread class represents a background thread where plugin instances
 // live.  Communication occurs between WebPluginDelegateProxy in the renderer
 // process and WebPluginDelegateStub in this thread through IPC messages.
-class PluginThread : public ChildThread {
+class PluginThread : public ChildThreadImpl {
  public:
   PluginThread();
   ~PluginThread() override;
   void Shutdown() override;
 
   // Returns the one plugin thread.
   static PluginThread* current();
 
   // Tells the plugin thread to terminate the process forcefully instead of
   // exiting cleanly.
@@ skipping 17 matching lines @@
   bool forcefully_terminate_plugin_process_;
 
   scoped_ptr<BlinkPlatformImpl> blink_platform_impl_;
 
   DISALLOW_COPY_AND_ASSIGN(PluginThread);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PLUGIN_PLUGIN_THREAD_H_