Remove unused parts of IPC::ChannelHandle.

chrome/browser/printing/printing_message_filter.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 CHROME_BROWSER_PRINTING_PRINTING_MESSAGE_FILTER_H_
 #define CHROME_BROWSER_PRINTING_PRINTING_MESSAGE_FILTER_H_
 
 #include <stdint.h>
 
 #include <memory>
 #include <string>
 
 #include "base/macros.h"
 #include "build/build_config.h"
 #include "components/prefs/pref_member.h"
 #include "content/public/browser/browser_message_filter.h"
 #include "printing/features/features.h"
 
 struct PrintHostMsg_ScriptedPrint_Params;
 class Profile;
 
 namespace base {
 class DictionaryValue;
+#if defined(OS_ANDROID)
+struct FileDescriptor;
+#endif
 }
 
 namespace printing {
 
 class PrintQueriesQueue;
 class PrinterQuery;
 
 // This class filters out incoming printing related IPC messages for the
 // renderer process on the IPC thread.
 class PrintingMessageFilter : public content::BrowserMessageFilter {
@@ skipping 59 matching lines @@
   const int render_process_id_;
 
   scoped_refptr<PrintQueriesQueue> queue_;
 
   DISALLOW_COPY_AND_ASSIGN(PrintingMessageFilter);
 };
 
 }  // namespace printing
 
 #endif  // CHROME_BROWSER_PRINTING_PRINTING_MESSAGE_FILTER_H_