Check BrowsingInstance before swapping prerenders.

content/browser/frame_host/render_frame_host_manager.h

 // Copyright 2013 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_FRAME_HOST_RENDER_FRAME_HOST_MANAGER_H_
 #define CONTENT_BROWSER_FRAME_HOST_RENDER_FRAME_HOST_MANAGER_H_
 
 #include "base/basictypes.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 377 matching lines @@
   void CommitPending();
 
   // Shutdown all RenderFrameHosts in a SiteInstance. This is called to shutdown
   // frames when all the frames in a SiteInstance are confirmed to be swapped
   // out.
   void ShutdownRenderFrameHostsInSiteInstance(int32 site_instance_id);
 
   // Helper method to terminate the pending RenderViewHost.
   void CancelPending();
 
+  // Helper method to set the active RenderFrameHost. Returns the old
+  // RenderFrameHost and updates counts.
+  scoped_ptr<RenderFrameHostImpl> SetRenderFrameHost(
+      scoped_ptr<RenderFrameHostImpl> render_frame_host);
+
   RenderFrameHostImpl* UpdateStateForNavigate(
       const NavigationEntryImpl& entry);
 
   // Called when a renderer process is starting to close.  We should not
   // schedule new navigations in its swapped out RenderFrameHosts after this.
   void RendererProcessClosing(RenderProcessHost* render_process_host);
 
   // For use in creating RenderFrameHosts.
   FrameTreeNode* frame_tree_node_;
 
@@ skipping 64 matching lines @@
   CrossProcessFrameConnector* cross_process_frame_connector_;
 
   base::WeakPtrFactory<RenderFrameHostManager> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderFrameHostManager);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_FRAME_HOST_RENDER_FRAME_HOST_MANAGER_H_