Makes RenderFrameObserver/RenderViewObserver::OnDestruct pure virtual.

content/renderer/push_messaging/push_messaging_dispatcher.cc

 // Copyright 2014 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 "content/renderer/push_messaging/push_messaging_dispatcher.h"
 
 #include "base/memory/ptr_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "content/child/service_worker/web_service_worker_registration_impl.h"
 #include "content/common/push_messaging_messages.h"
@@ skipping 21 matching lines @@
   IPC_BEGIN_MESSAGE_MAP(PushMessagingDispatcher, message)
     IPC_MESSAGE_HANDLER(PushMessagingMsg_SubscribeFromDocumentSuccess,
                         OnSubscribeFromDocumentSuccess)
     IPC_MESSAGE_HANDLER(PushMessagingMsg_SubscribeFromDocumentError,
                         OnSubscribeFromDocumentError)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   return handled;
 }
 
+void PushMessagingDispatcher::OnDestruct() {
+  delete this;
+}
+
 void PushMessagingDispatcher::subscribe(
     blink::WebServiceWorkerRegistration* service_worker_registration,
     const blink::WebPushSubscriptionOptions& options,
     blink::WebPushSubscriptionCallbacks* callbacks) {
   DCHECK(service_worker_registration);
   DCHECK(callbacks);
   // If a developer provided an application server key in |options|, skip
   // fetching the manifest.
   if (options.applicationServerKey.isEmpty()) {
     RenderFrameImpl::FromRoutingID(routing_id())
@@ skipping 83 matching lines @@
           : blink::WebPushError::ErrorTypeAbort;
 
   callbacks->onError(blink::WebPushError(
       error_type,
       blink::WebString::fromUTF8(PushRegistrationStatusToString(status))));
 
   subscription_callbacks_.Remove(request_id);
 }
 
 }  // namespace content