Remove NotificationDelegate::process_id().

chrome/browser/notifications/notification_object_proxy.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/notifications/notification_object_proxy.h"
 
 #include "base/guid.h"
 #include "base/strings/stringprintf.h"
 #include "content/public/browser/desktop_notification_delegate.h"
 #include "content/public/browser/render_frame_host.h"
@@ skipping 31 matching lines @@
 }
 
 void NotificationObjectProxy::Click() {
   delegate_->NotificationClick();
 }
 
 std::string NotificationObjectProxy::id() const {
   return id_;
 }
 
-int NotificationObjectProxy::process_id() const {
-  return render_process_id_;
-}
-
 content::WebContents* NotificationObjectProxy::GetWebContents() const {
   return content::WebContents::FromRenderFrameHost(
       content::RenderFrameHost::FromID(render_process_id_, render_frame_id_));
 }