Remove old session history logic.

content/browser/renderer_host/render_view_host_impl.h

Index: content/browser/renderer_host/render_view_host_impl.h
diff --git a/content/browser/renderer_host/render_view_host_impl.h b/content/browser/renderer_host/render_view_host_impl.h
index a2a03592fe02d03e3de4e0172b471ad31f5524aa..ec13a29332f33d95931606b4cc83cc5945ef3c82 100644
--- a/content/browser/renderer_host/render_view_host_impl.h
+++ b/content/browser/renderer_host/render_view_host_impl.h
@@ -35,7 +35,6 @@
 
 namespace content {
 
-class PageState;
 struct FrameReplicationState;
 
 // This implements the RenderViewHost interface that is exposed to
@@ -235,7 +234,6 @@ class CONTENT_EXPORT RenderViewHostImpl : public RenderViewHost,
   void OnShowWidget(int route_id, const gfx::Rect& initial_rect);
   void OnShowFullscreenWidget(int route_id);
   void OnRenderProcessGone(int status, int error_code);
-  void OnUpdateState(const PageState& state);
   void OnUpdateTargetURL(const GURL& url);
   void OnClose();
   void OnRequestMove(const gfx::Rect& pos);