Makes RenderFrameObserver/RenderViewObserver::OnDestruct pure virtual.

extensions/renderer/api/automation/automation_api_helper.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 "extensions/renderer/api/automation/automation_api_helper.h"
 
 #include "content/public/renderer/render_view.h"
 #include "extensions/common/extension_messages.h"
 #include "third_party/WebKit/public/web/WebAXObject.h"
 #include "third_party/WebKit/public/web/WebDocument.h"
@@ skipping 14 matching lines @@
 
 bool AutomationApiHelper::OnMessageReceived(const IPC::Message& message) {
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(AutomationApiHelper, message)
     IPC_MESSAGE_HANDLER(ExtensionMsg_AutomationQuerySelector, OnQuerySelector)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   return handled;
 }
 
+void AutomationApiHelper::OnDestruct() {
+  delete this;
+}
+
 void AutomationApiHelper::OnQuerySelector(int request_id,
                                           int acc_obj_id,
                                           const base::string16& selector) {
   ExtensionHostMsg_AutomationQuerySelector_Error error;
   if (!render_view() || !render_view()->GetWebView() ||
       !render_view()->GetWebView()->mainFrame()) {
     error.value = ExtensionHostMsg_AutomationQuerySelector_Error::kNoMainFrame;
     Send(new ExtensionHostMsg_AutomationQuerySelector_Result(
         routing_id(), request_id, error, 0));
     return;
@@ skipping 35 matching lines @@
         result_acc_obj = result_acc_obj.parentObject();
 
       result_acc_obj_id = result_acc_obj.axID();
     }
   }
   Send(new ExtensionHostMsg_AutomationQuerySelector_Result(
       routing_id(), request_id, error, result_acc_obj_id));
 }
 
 }  // namespace extensions