mac: Prepare for -Wunused-functions.

chrome/browser/renderer_host/pepper/pepper_talk_host.cc

 // 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.
 
 #include "chrome/browser/renderer_host/pepper/pepper_talk_host.h"
 
 #include "base/bind.h"
 #include "content/public/browser/browser_ppapi_host.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/render_view_host.h"
@@ skipping 63 matching lines @@
   reply.params.set_result(static_cast<int32_t>(
       chrome::ShowMessageBox(parent, title, message,
                              chrome::MESSAGE_BOX_TYPE_QUESTION) ==
       chrome::MESSAGE_BOX_RESULT_YES));
 #else
   NOTIMPLEMENTED();
 #endif
   return reply;
 }
 
+#if defined(USE_ASH) && defined(OS_CHROMEOS)
 void OnTerminateRemotingEventOnUIThread(const base::Closure& stop_callback) {
   content::BrowserThread::PostTask(content::BrowserThread::IO, FROM_HERE,
                                    stop_callback);
 }
+#endif  // defined(USE_ASH) && defined(OS_CHROMEOS)
 
 ppapi::host::ReplyMessageContext StartRemotingOnUIThread(
     const base::Closure& stop_callback,
     int render_process_id,
     int render_view_id,
     ppapi::host::ReplyMessageContext reply) {
   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
   content::RenderViewHost* render_view_host =
       content::RenderViewHost::FromID(render_process_id, render_view_id);
   if (!render_view_host) {
@@ skipping 144 matching lines @@
 }
 
 void PepperTalkHost::OnStopRemotingCompleted(
     ppapi::host::ReplyMessageContext reply) {
   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::IO));
   remoting_started_ = false;
   host()->SendReply(reply, PpapiPluginMsg_Talk_StopRemotingReply());
 }
 
 }  // namespace chrome