Change IsSwappedOut to const and do a more restrictive check.

content/browser/web_contents/render_view_host_manager.h

 // Copyright (c) 2012 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.
 
 #ifndef CONTENT_BROWSER_WEB_CONTENTS_RENDER_VIEW_HOST_MANAGER_H_
 #define CONTENT_BROWSER_WEB_CONTENTS_RENDER_VIEW_HOST_MANAGER_H_
 
 #include "base/basictypes.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 203 matching lines @@
   // NotificationObserver implementation.
   virtual void Observe(int type,
                        const NotificationSource& source,
                        const NotificationDetails& details) OVERRIDE;
 
   // Called when a RenderViewHost is about to be deleted.
   void RenderViewDeleted(RenderViewHost* rvh);
 
   // Returns whether the given RenderViewHost is on the list of swapped out
   // RenderViewHosts.
-  bool IsSwappedOut(RenderViewHost* rvh);
+  bool IsSwappedOut(RenderViewHost* rvh) const;
 
   // Returns the swapped out RenderViewHost for the given SiteInstance, if any.
   RenderViewHostImpl* GetSwappedOutRenderViewHost(SiteInstance* instance);
 
  private:
   friend class RenderViewHostManagerTest;
   friend class TestWebContents;
 
   // Returns whether this tab should transition to a new renderer for
   // cross-site URLs.  Enabled unless we see the --process-per-tab command line
@@ skipping 84 matching lines @@
 
   // The intersitial page currently shown if any, not own by this class
   // (the InterstitialPage is self-owned, it deletes itself when hidden).
   InterstitialPageImpl* interstitial_page_;
 
   NotificationRegistrar registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderViewHostManager);
 };
 
-}  // namespace content      
+}  // namespace content
 
 #endif  // CONTENT_BROWSER_WEB_CONTENTS_RENDER_VIEW_HOST_MANAGER_H_