Remove PrerenderManager.enabled_ and related members.

chrome/browser/prerender/prerender_manager.h

Index: chrome/browser/prerender/prerender_manager.h
diff --git a/chrome/browser/prerender/prerender_manager.h b/chrome/browser/prerender/prerender_manager.h
index 35c6a5cf72ada540d1af56c66dd35c4780911390..cef7c59db035e61596b189b72a5c0f8cb96c17fd 100644
--- a/chrome/browser/prerender/prerender_manager.h
+++ b/chrome/browser/prerender/prerender_manager.h
@@ -194,12 +194,6 @@ class PrerenderManager : public base::SupportsWeakPtr<PrerenderManager>,
       double fraction_plt_elapsed_at_swap_in,
       const GURL& url);
 
-  // Set whether prerendering is currently enabled for this manager.
-  // Must be called on the UI thread.
-  // If |enabled| is false, existing prerendered pages will still persist until
-  // they time out, but new ones will not be generated.
-  void set_enabled(bool enabled);
-
   static PrerenderManagerMode GetMode();
   static void SetMode(PrerenderManagerMode mode);
   static const char* GetModeString();
@@ -677,11 +671,6 @@ class PrerenderManager : public base::SupportsWeakPtr<PrerenderManager>,
   // The configuration.
   Config config_;
 
-  // Specifies whether prerendering is currently enabled for this
-  // manager. The value can change dynamically during the lifetime
-  // of the PrerenderManager.
-  bool enabled_;
-
   // The profile that owns this PrerenderManager.
   Profile* profile_;