Remove page id from title and state updating.

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 f8cce52869a4ddb8860c6bd3541a864376f7e0e2..01871e8eb1a49c3f907e0adf99a5dc262f44df83 100644
--- a/content/browser/renderer_host/render_view_host_impl.h
+++ b/content/browser/renderer_host/render_view_host_impl.h
@@ -287,7 +287,7 @@ 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(int32_t page_id, const PageState& state);
+  void OnUpdateState(const PageState& state);
   void OnUpdateTargetURL(const GURL& url);
   void OnClose();
   void OnRequestMove(const gfx::Rect& pos);
@@ -359,11 +359,6 @@ class CONTENT_EXPORT RenderViewHostImpl : public RenderViewHost,
   // See BindingsPolicy for details.
   int enabled_bindings_;
 
-  // The most recent page ID we've heard from the renderer process.  This is
-  // used as context when other session history related IPCs arrive.
-  // TODO(creis): Allocate this in WebContents/NavigationController instead.
-  int32_t page_id_;
-
   // Tracks whether this RenderViewHost is in an active state.  False if the
   // main frame is pending swap out, pending deletion, or swapped out, because
   // it is not visible to the user in any of these cases.