Introduce content::PageState

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 f2be7e15ed3e940a48cb5cd7d8c88957cd404de4..d9ad8efd89ca057a7fae53342a3c6003d2764241 100644
--- a/content/browser/renderer_host/render_view_host_delegate.h
+++ b/content/browser/renderer_host/render_view_host_delegate.h
@@ -47,6 +47,7 @@ class Size;
 namespace content {
 
 class BrowserContext;
+class PageState;
 class RenderViewHost;
 class RenderViewHostDelegateView;
 class SessionStorageNamespace;
@@ -170,7 +171,7 @@ class CONTENT_EXPORT RenderViewHostDelegate {
   // The state for the page changed and should be updated.
   virtual void UpdateState(RenderViewHost* render_view_host,
                            int32 page_id,
-                           const std::string& state) {}
+                           const PageState& state) {}
 
   // The page's title was changed and should be updated.
   virtual void UpdateTitle(RenderViewHost* render_view_host,