<webview>: Cleanup WebRequest event listeners when embedder destroyed

content/browser/browser_plugin/browser_plugin_guest.h

 // 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.
 
 // A BrowserPluginGuest is the browser side of a browser <--> embedder
 // renderer channel. A BrowserPlugin (a WebPlugin) is on the embedder
 // renderer side of browser <--> embedder renderer communication.
 //
 // BrowserPluginGuest lives on the UI thread of the browser process. It has a
 // helper, BrowserPluginGuestHelper, which is a RenderViewHostObserver. The
@@ skipping 86 matching lines @@
       int instance_id,
       WebContentsImpl* web_contents,
       scoped_ptr<base::DictionaryValue> extra_params);
 
   static BrowserPluginGuest* CreateWithOpener(
       int instance_id,
       WebContentsImpl* web_contents,
       BrowserPluginGuest* opener,
       bool has_render_view);
 
+  // Called when the embedder RenderViewHost is destroyed to give the
+  // BrowserPluginGuest an opportunity to clean up after itself.
+  void EmbedderDestroyed();
+
   // Destroys the guest WebContents and all its associated state, including
   // this BrowserPluginGuest, and its new unattached windows.
   void Destroy();
 
   // Returns the identifier that uniquely identifies a browser plugin guest
   // within an embedder.
   int instance_id() const { return instance_id_; }
 
   // Overrides factory for testing. Default (NULL) value indicates regular
   // (non-test) environment.
@@ skipping 414 matching lines @@
   std::queue<IPC::Message*> pending_messages_;
 
   scoped_ptr<BrowserPluginGuestDelegate> delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserPluginGuest);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_BROWSER_PLUGIN_BROWSER_PLUGIN_GUEST_H_