Fix: Prerendering was confusing SessionService to not save sessionStorage.

chrome/browser/sessions/session_service.h

Index: chrome/browser/sessions/session_service.h
diff --git a/chrome/browser/sessions/session_service.h b/chrome/browser/sessions/session_service.h
index b1066405dccf260ffa63ea7513b6d7f39c2e2763..67fd97df0687713009696eed05e70145169e2bbf 100644
--- a/chrome/browser/sessions/session_service.h
+++ b/chrome/browser/sessions/session_service.h
@@ -28,6 +28,7 @@ struct SessionWindow;
 
 namespace content {
 class NavigationEntry;
+class WebContents;
 }
 
 // SessionService ------------------------------------------------------------
@@ -123,6 +124,12 @@ class SessionService : public BaseSessionService,
   // Notification a window has finished closing.
   void WindowClosed(const SessionID& window_id);
 
+  // Called when a tab is inserted.
+  void TabInserted(content::WebContents* contents);
+
+  // Called when a tab is closing.
+  void TabClosing(content::WebContents* contents);
+
   // Sets the type of window. In order for the contents of a window to be
   // tracked SetWindowType must be invoked with a type we track
   // (should_track_changes_for_browser_type returns true).