[Tests not passing yet] Remove prerender sessionStorage namespace merging.

chrome/browser/prerender/prerender_histograms.cc

Index: chrome/browser/prerender/prerender_histograms.cc
diff --git a/chrome/browser/prerender/prerender_histograms.cc b/chrome/browser/prerender/prerender_histograms.cc
index be26ecb89ad5116cd7f1014471b02e1e1dbfc0ce..a45c835f6dc4b7eaf34cd80b9de859279ae96f39 100644
--- a/chrome/browser/prerender/prerender_histograms.cc
+++ b/chrome/browser/prerender/prerender_histograms.cc
@@ -68,7 +68,7 @@ std::string GetHistogramName(Origin origin, uint8 experiment_id,
     default:
       NOTREACHED();
       break;
-  };
+  }
 
   // Dummy return value to make the compiler happy.
   NOTREACHED();
@@ -398,14 +398,6 @@ void PrerenderHistograms::RecordFinalStatus(
   }
 }
 
-void PrerenderHistograms::RecordEvent(Origin origin, uint8 experiment_id,
-                                      PrerenderEvent event) const {
-  DCHECK_LT(event, PRERENDER_EVENT_MAX);
-  PREFIXED_HISTOGRAM_ORIGIN_EXPERIMENT(
-      "Event", origin, experiment_id,
-      UMA_HISTOGRAM_ENUMERATION(name, event, PRERENDER_EVENT_MAX));
-}
-
 void PrerenderHistograms::RecordCookieStatus(Origin origin,
                                              uint8 experiment_id,
                                              int cookie_status) const {