Enable the side-effect free whitelist and use it for local browsing based

chrome/browser/prerender/prerender_local_predictor.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 CHROME_BROWSER_PRERENDER_PRERENDER_LOCAL_PREDICTOR_H_
 #define CHROME_BROWSER_PRERENDER_PRERENDER_LOCAL_PREDICTOR_H_
 
 #include <vector>
 
 #include "base/hash_tables.h"
@@ skipping 71 matching lines @@
     EVENT_CONTINUE_PRERENDER_CHECK_NOT_LOGGED_IN = 40,
     EVENT_CONTINUE_PRERENDER_CHECK_FALLTHROUGH_NOT_PRERENDERING = 41,
     EVENT_CONTINUE_PRERENDER_CHECK_ISSUING_PRERENDER = 42,
     EVENT_ISSUING_PRERENDER = 43,
     EVENT_NO_PRERENDER_CANDIDATES = 44,
     EVENT_GOT_HISTORY_ISSUING_LOOKUP = 45,
     EVENT_TAB_HELPER_URL_SEEN = 46,
     EVENT_TAB_HELPER_URL_SEEN_MATCH = 47,
     EVENT_TAB_HELPER_URL_SEEN_NAMESPACE_MATCH = 48,
     EVENT_PRERENDER_URL_LOOKUP_MULTIPLE_SOURCE_WEBCONTENTS_FOUND = 49,
+    EVENT_CONTINUE_PRERENDER_CHECK_ON_SIDE_EFFECT_FREE_WHITELIST = 50,
     EVENT_MAX_VALUE
   };
 
   // A PrerenderLocalPredictor is owned by the PrerenderManager specified
   // in the constructor.  It will be destoryed at the time its owning
   // PrerenderManager is destroyed.
   explicit PrerenderLocalPredictor(PrerenderManager* prerender_manager);
   virtual ~PrerenderLocalPredictor();
 
   void Shutdown();
@@ skipping 65 matching lines @@
   // that could have possibily been swapped in were not swapped in. For
   // measurement purposes only.
   bool current_prerender_would_have_matched_;
 
   DISALLOW_COPY_AND_ASSIGN(PrerenderLocalPredictor);
 };
 
 }  // namespace prerender
 
 #endif  // CHROME_BROWSER_PRERENDER_PRERENDER_LOCAL_PREDICTOR_H_