Make IPC::Channel::Listener:OnMessageReceived have a return value indicating ...

ppapi/proxy/ppb_pdf_proxy.h

 // Copyright (c) 2010 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 PPAPI_PPB_PDF_PROXY_H_
 #define PPAPI_PPB_PDF_PROXY_H_
 
 #include "ppapi/c/pp_module.h"
 #include "ppapi/proxy/interface_proxy.h"
 
 struct PPB_PDF;
 
 namespace pp {
 namespace proxy {
 
 struct SerializedFontDescription;
 
 class PPB_PDF_Proxy : public InterfaceProxy {
  public:
   PPB_PDF_Proxy(Dispatcher* dispatcher, const void* target_interface);
   virtual ~PPB_PDF_Proxy();
 
   const PPB_PDF* ppb_pdf_target() const {
     return static_cast<const PPB_PDF*>(target_interface());
   }
 
   // InterfaceProxy implementation.
   virtual const void* GetSourceInterface() const;
   virtual InterfaceID GetInterfaceId() const;
-  virtual void OnMessageReceived(const IPC::Message& msg);
+  virtual bool OnMessageReceived(const IPC::Message& msg);
 
  private:
   // Message handlers.
   void OnMsgGetFontFileWithFallback(PP_Module module,
                                     const SerializedFontDescription& desc,
                                     int32_t charset,
                                     PP_Resource* result);
   void OnMsgGetFontTableForPrivateFontFile(PP_Resource font_file,
                                            uint32_t table,
                                            std::string* result);
 };
 
 }  // namespace proxy
 }  // namespace pp
 
 #endif  // PPAPI_PPB_PDF_PROXY_H_