Revert of OOPIF: Specify previous sibling frames when creating new RenderFrames.

content/browser/frame_host/render_frame_host_impl.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_IMPL_H_
 #define CONTENT_BROWSER_FRAME_HOST_RENDER_FRAME_HOST_IMPL_H_
 
 #include <map>
 #include <vector>
 
@@ skipping 161 matching lines @@
   gfx::AcceleratedWidget AccessibilityGetAcceleratedWidget() override;
   gfx::NativeViewAccessible AccessibilityGetNativeViewAccessible() override;
   BrowserAccessibilityManager* AccessibilityGetChildFrame(
       int accessibility_node_id) override;
   void AccessibilityGetAllChildFrames(
       std::vector<BrowserAccessibilityManager*>* child_frames) override;
   BrowserAccessibility* AccessibilityGetParentFrame() override;
 
   // Creates a RenderFrame in the renderer process.  Only called for
   // cross-process subframe navigations in --site-per-process.
-  bool CreateRenderFrame(int parent_routing_id,
-                         int previous_sibling_routing_id,
-                         int proxy_routing_id);
+  bool CreateRenderFrame(int parent_routing_id, int proxy_routing_id);
 
   // Returns whether the RenderFrame in the renderer process has been created
   // and still has a connection.  This is valid for all frames.
   bool IsRenderFrameLive();
 
   // Tracks whether the RenderFrame for this RenderFrameHost has been created in
   // the renderer process.  This is currently only used for subframes.
   // TODO(creis): Use this for main frames as well when RVH goes away.
   void SetRenderFrameCreated(bool created);
 
@@ skipping 533 matching lines @@
 
   // NOTE: This must be the last member.
   base::WeakPtrFactory<RenderFrameHostImpl> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderFrameHostImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_FRAME_HOST_RENDER_FRAME_HOST_IMPL_H_