Remove redundant boolean from unit test code.

chrome/browser/prerender/prerender_contents.h

Index: chrome/browser/prerender/prerender_contents.h
diff --git a/chrome/browser/prerender/prerender_contents.h b/chrome/browser/prerender/prerender_contents.h
index dfce05bdc7332310a0be294fb2e135a2e79a8e19..9546da7eac65d8f26a83ac92bc72ee37c7317374 100644
--- a/chrome/browser/prerender/prerender_contents.h
+++ b/chrome/browser/prerender/prerender_contents.h
@@ -243,6 +243,8 @@ class PrerenderContents : public content::NotificationObserver,
   virtual content::WebContents* CreateWebContents(
       content::SessionStorageNamespace* session_storage_namespace);
 
+  bool prerendering_has_started_;
+
  private:
   class TabContentsDelegateImpl;
 
@@ -300,8 +302,6 @@ class PrerenderContents : public content::NotificationObserver,
   // |this|, when |this| has a RenderView.
   FinalStatus final_status_;
 
-  bool prerendering_has_started_;
-
   // The MatchComplete status of the prerender, indicating how it relates
   // to being a MatchComplete dummy (see definition of MatchCompleteStatus
   // above).