Get rid of extensions dependency from content\browser.

content/browser/site_instance.h

 // Copyright (c) 2011 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_BROWSER_RENDERER_HOST_SITE_INSTANCE_H_
 #define CONTENT_BROWSER_RENDERER_HOST_SITE_INSTANCE_H_
 #pragma once
 
 #include "content/browser/renderer_host/render_process_host.h"
 #include "content/common/notification_observer.h"
@@ skipping 131 matching lines @@
   friend class BrowsingInstance;
 
   // Virtual to allow tests to extend it.
   virtual ~SiteInstance();
 
   // Create a new SiteInstance.  Protected to give access to BrowsingInstance
   // and tests; most callers should use CreateSiteInstance or
   // GetRelatedSiteInstance instead.
   explicit SiteInstance(BrowsingInstance* browsing_instance);
 
-  // Get the effective URL for the given actual URL. If the URL is part of an
-  // installed app, the effective URL is an extension URL with the ID of that
-  // extension as the host. This has the effect of grouping apps together in
-  // a common SiteInstance.
+  // Get the effective URL for the given actual URL.
   static GURL GetEffectiveURL(Profile* profile, const GURL& url);
 
   // Returns the type of renderer process this instance belongs in, for grouping
   // purposes.
   RenderProcessHost::Type GetRendererType();
 
  private:
   // NotificationObserver implementation.
   virtual void Observe(NotificationType type,
                        const NotificationSource& source,
@@ skipping 22 matching lines @@
   // The web site that this SiteInstance is rendering pages for.
   GURL site_;
 
   // Whether SetSite has been called.
   bool has_site_;
 
   DISALLOW_COPY_AND_ASSIGN(SiteInstance);
 };
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_SITE_INSTANCE_H_