Makes RenderFrameObserver/RenderViewObserver::OnDestruct pure virtual.

extensions/renderer/extension_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/extension_helper.h"
 
 #include <stddef.h>
 
 #include "content/public/renderer/render_view.h"
 #include "extensions/common/constants.h"
@@ skipping 23 matching lines @@
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(ExtensionHelper, message)
     IPC_MESSAGE_HANDLER(ExtensionMsg_SetFrameName, OnSetFrameName)
     IPC_MESSAGE_HANDLER(ExtensionMsg_AppWindowClosed,
                         OnAppWindowClosed)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   return handled;
 }
 
+void ExtensionHelper::OnDestruct() {
+  delete this;
+}
+
 void ExtensionHelper::DraggableRegionsChanged(blink::WebFrame* frame) {
   blink::WebVector<blink::WebDraggableRegion> webregions =
       frame->document().draggableRegions();
   std::vector<DraggableRegion> regions;
   for (size_t i = 0; i < webregions.size(); ++i) {
     DraggableRegion region;
     render_view()->ConvertViewportToWindowViaWidget(&webregions[i].bounds);
     region.bounds = webregions[i].bounds;
     region.draggable = webregions[i].draggable;
     regions.push_back(region);
@@ skipping 13 matching lines @@
       render_view()->GetWebView()->mainFrame()->mainWorldScriptContext();
   ScriptContext* script_context =
       dispatcher_->script_context_set().GetByV8Context(v8_context);
   if (!script_context)
     return;
   script_context->module_system()->CallModuleMethod("app.window",
                                                     "onAppWindowClosed");
 }
 
 }  // namespace extensions