<webview>: Implement WebRequest API

content/public/browser/content_browser_client.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.
 
 #ifndef CONTENT_PUBLIC_BROWSER_CONTENT_BROWSER_CLIENT_H_
 #define CONTENT_PUBLIC_BROWSER_CONTENT_BROWSER_CLIENT_H_
 
 #include <string>
 #include <utility>
 #include <vector>
@@ skipping 99 matching lines @@
   virtual WebContentsViewDelegate* GetWebContentsViewDelegate(
       WebContents* web_contents);
 
   // Notifies that a new RenderHostView has been created.
   virtual void RenderViewHostCreated(RenderViewHost* render_view_host) {}
 
   // Notifies that a <webview> guest WebContents has been created.
   virtual void GuestWebContentsCreated(WebContents* guest_web_contents,
                                        WebContents* embedder_web_contents) {}
 
+  // Notifies that a <webview> guest WebContents has been destroyed.
+  virtual void GuestWebContentsDestroyed(WebContents* guest_web_contents,

[jam, 2013/02/06 23:34:00]

nit: don't add this since it can be done in a way that doesn't expand the
content api. use a WebContentsObserver that's attached to the WC

+                                         WebContents* embedder_web_contents) {}
+
   // Notifies that a RenderProcessHost has been created. This is called before
   // the content layer adds its own BrowserMessageFilters, so that the
   // embedder's IPC filters have priority.
   virtual void RenderProcessHostCreated(RenderProcessHost* host) {}
 
   // Notifies that a BrowserChildProcessHost has been created.
   virtual void BrowserChildProcessHostCreated(BrowserChildProcessHost* host) {}
 
   // Get the effective URL for the given actual URL, to allow an embedder to
   // group different url schemes in the same SiteInstance.
@@ skipping 341 matching lines @@
   // This is called on a worker thread.
   virtual
       crypto::CryptoModuleBlockingPasswordDelegate* GetCryptoPasswordDelegate(
           const GURL& url);
 #endif
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_CONTENT_BROWSER_CLIENT_H_