[Sync] Fix Session's handling of windows.

chrome/browser/sessions/session_restore.h

Index: chrome/browser/sessions/session_restore.h
diff --git a/chrome/browser/sessions/session_restore.h b/chrome/browser/sessions/session_restore.h
index 5c9290457ad231956243ec2427046bb1f2d8bbd9..4ed27f021624356c8490770d6d71bae3667bf568 100644
--- a/chrome/browser/sessions/session_restore.h
+++ b/chrome/browser/sessions/session_restore.h
@@ -47,8 +47,8 @@ class SessionRestore {
   // restores the given session windows to a browser.
   static void RestoreForeignSessionWindows(
       Profile* profile,
-      std::vector<SessionWindow*>::const_iterator begin,
-      std::vector<SessionWindow*>::const_iterator end);
+      std::vector<const SessionWindow*>::const_iterator begin,
+      std::vector<const SessionWindow*>::const_iterator end);
 
   // Specifically used in the restoration of a foreign session.  This method
   // restores the given session tab to a browser.