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

content/public/renderer/render_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_PUBLIC_RENDERER_RENDER_THREAD_H_
 #define CONTENT_PUBLIC_RENDERER_RENDER_THREAD_H_
 
 #include "base/basictypes.h"
 #include "base/callback.h"
 #include "base/memory/shared_memory.h"
 #include "base/metrics/user_metrics_action.h"
 #include "content/common/content_export.h"
+#include "content/public/child/child_thread.h"
 #include "ipc/ipc_channel_proxy.h"
-#include "ipc/ipc_sender.h"
-
-#if defined(OS_WIN)
-#include <windows.h>
-#endif
 
 class GURL;
 
 namespace base {
 class MessageLoop;
 class MessageLoopProxy;
 class WaitableEvent;
 }
 
 namespace cc {
 class SharedBitmapManager;
 }
 
 namespace IPC {
 class MessageFilter;
 class SyncChannel;
 class SyncMessageFilter;
 }
 
 namespace v8 {
 class Extension;
 }
 
 namespace content {
 
 class RenderProcessObserver;
 class ResourceDispatcherDelegate;
 class ServiceRegistry;
 
-class CONTENT_EXPORT RenderThread : public IPC::Sender {
+class CONTENT_EXPORT RenderThread : virtual public ChildThread {
  public:
   // Returns the one render thread for this process.  Note that this can only
   // be accessed when running on the render thread itself.
   static RenderThread* Get();
 
   RenderThread();
   ~RenderThread() override;
 
   virtual scoped_refptr<base::SingleThreadTaskRunner> GetTaskRunner() = 0;
   virtual IPC::SyncChannel* GetChannel() = 0;
@@ skipping 69 matching lines @@
   virtual int PostTaskToAllWebWorkers(const base::Closure& closure) = 0;
 
   // Resolve the proxy servers to use for a given url. On success true is
   // returned and |proxy_list| is set to a PAC string containing a list of
   // proxy servers.
   virtual bool ResolveProxy(const GURL& url, std::string* proxy_list) = 0;
 
   // Gets the shutdown event for the process.
   virtual base::WaitableEvent* GetShutdownEvent() = 0;
 
-#if defined(OS_WIN)
-  // Request that the given font be loaded by the browser so it's cached by the
-  // OS. Please see ChildProcessHost::PreCacheFont for details.
-  virtual void PreCacheFont(const LOGFONT& log_font) = 0;
-
-  // Release cached font.
-  virtual void ReleaseCachedFonts() = 0;
-#endif
-
   // Returns the ServiceRegistry for this thread.
   virtual ServiceRegistry* GetServiceRegistry() = 0;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_RENDERER_RENDER_THREAD_H_