Makes RenderFrameObserver/RenderViewObserver::OnDestruct pure virtual.

android_webview/renderer/aw_message_port_client.cc

 // Copyright 2015 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 "android_webview/renderer/aw_message_port_client.h"
 
 #include <memory>
 #include <utility>
 
 #include "android_webview/common/aw_message_port_messages.h"
@@ skipping 26 matching lines @@
   IPC_BEGIN_MESSAGE_MAP(AwMessagePortClient, message)
     IPC_MESSAGE_HANDLER(AwMessagePortMsg_WebToAppMessage, OnWebToAppMessage)
     IPC_MESSAGE_HANDLER(AwMessagePortMsg_AppToWebMessage, OnAppToWebMessage)
     IPC_MESSAGE_HANDLER(AwMessagePortMsg_ClosePort, OnClosePort)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
 
   return handled;
 }
 
+void AwMessagePortClient::OnDestruct() {
+  delete this;
+}
+
 void AwMessagePortClient::OnWebToAppMessage(
     int message_port_id,
     const base::string16& message,
     const vector<int>& sent_message_port_ids) {
   v8::HandleScope handle_scope(blink::mainThreadIsolate());
   blink::WebFrame* main_frame =
       render_frame()->GetRenderView()->GetWebView()->mainFrame();
   if (main_frame == nullptr) {
     return;
   }
@@ skipping 45 matching lines @@
       render_frame()->GetRoutingID(), message_port_id,
       result, sent_message_port_ids));
 }
 
 void AwMessagePortClient::OnClosePort(int message_port_id) {
   Send(new AwMessagePortHostMsg_ClosePortAck(render_frame()->GetRoutingID(),
                                              message_port_id));
 }
 
 }