Move IsRendererTransferNeededForNavigation to RenderFrameHostManager.

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 <list>
 #include <map>
 
@@ skipping 305 matching lines @@
   // transferred between renderers.
   void OnCrossSiteResponse(
       RenderFrameHostImpl* pending_render_frame_host,
       const GlobalRequestID& global_request_id,
       scoped_ptr<CrossSiteTransferringRequest> cross_site_transferring_request,
       const std::vector<GURL>& transfer_url_chain,
       const Referrer& referrer,
       ui::PageTransition page_transition,
       bool should_replace_current_entry);
 
+  // Determines whether a navigation to |dest_url| may be completed using an
+  // existing RenderFrameHost, or whether transferring to a new RenderFrameHost
+  // backed by a different render process is required. This is a security policy
+  // check determined by the current site isolation mode, and must be done
+  // before the resource at |dest_url| is delivered to |existing_rfh|.
+  //
+  // |existing_rfh| must belong to this RFHM, but it can be a pending or current
+  // host.
+  //
+  // When this function returns true for a subframe, an out-of-process iframe
+  // must be created.
+  bool IsRendererTransferNeededForNavigation(RenderFrameHostImpl* existing_rfh,
+                                             const GURL& dest_url);
+
   // Called when a renderer's frame navigates.
   void DidNavigateFrame(RenderFrameHostImpl* render_frame_host,
                         bool was_caused_by_user_gesture);
 
   // Called when this frame's opener is changed to the frame specified by
   // |opener_routing_id| in |source_site_instance|'s process.  This change
   // could come from either the current RenderFrameHost or one of the
   // proxies (e.g., window.open that targets a RemoteFrame by name).  The
   // updated opener will be forwarded to any other RenderFrameProxies and
   // RenderFrames for this FrameTreeNode.
@@ skipping 478 matching lines @@
   bool should_reuse_web_ui_;
 
   base::WeakPtrFactory<RenderFrameHostManager> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderFrameHostManager);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_FRAME_HOST_RENDER_FRAME_HOST_MANAGER_H_