Fixes bug where triggering session restore while the browser was...

chrome/browser/sessions/session_restore.h

Index: chrome/browser/sessions/session_restore.h
===================================================================
--- chrome/browser/sessions/session_restore.h	(revision 42688)
+++ chrome/browser/sessions/session_restore.h	(working copy)
@@ -1,4 +1,4 @@
-// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
+// Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
@@ -42,6 +42,9 @@
       Profile* profile,
       const std::vector<GURL>& urls_to_open);
 
+  // Returns true if we're in the process of restoring.
+  static bool IsRestoring();
+
   // The max number of non-selected tabs SessionRestore loads when restoring
   // a session. A value of 0 indicates all tabs are loaded at once.
   static size_t num_tabs_to_load_;