<webview>: Implement WebRequest API

content/public/browser/content_browser_client.h

Index: content/public/browser/content_browser_client.h
diff --git a/content/public/browser/content_browser_client.h b/content/public/browser/content_browser_client.h
index b332073a9cb9cbead5b6cf0e2e94ce0c75d983e1..980ed5b46be2133a9f95c56f0575fae0d0fb966b 100644
--- a/content/public/browser/content_browser_client.h
+++ b/content/public/browser/content_browser_client.h
@@ -117,6 +117,10 @@ class CONTENT_EXPORT ContentBrowserClient {
   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.