Remove old session history logic.

content/browser/renderer_host/render_view_host_delegate.h

Index: content/browser/renderer_host/render_view_host_delegate.h
diff --git a/content/browser/renderer_host/render_view_host_delegate.h b/content/browser/renderer_host/render_view_host_delegate.h
index a6864b48d877853c52e546c947b8fa3643f29402..eb94b8ee3213a111f27db69d5778584e325d23d5 100644
--- a/content/browser/renderer_host/render_view_host_delegate.h
+++ b/content/browser/renderer_host/render_view_host_delegate.h
@@ -32,7 +32,6 @@ namespace content {
 
 class BrowserContext;
 class FrameTree;
-class PageState;
 class RenderViewHost;
 class RenderViewHostImpl;
 class RenderViewHostDelegateView;
@@ -85,10 +84,6 @@ class CONTENT_EXPORT RenderViewHostDelegate {
   // RenderView is going to be destroyed
   virtual void RenderViewDeleted(RenderViewHost* render_view_host) {}
 
-  // The state for the page changed and should be updated.
-  virtual void UpdateState(RenderViewHost* render_view_host,
-                           const PageState& state) {}
-
   // The destination URL has changed should be updated.
   virtual void UpdateTargetURL(RenderViewHost* render_view_host,
                                const GURL& url) {}