PrerenderManager: No longer expose weak pointers.

chrome/browser/prerender/prerender_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 CHROME_BROWSER_PRERENDER_PRERENDER_MANAGER_H_
 #define CHROME_BROWSER_PRERENDER_PRERENDER_MANAGER_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 53 matching lines @@
 class PrerenderInProcessBrowserTest;
 }
 
 class PrerenderHandle;
 class PrerenderHistory;
 class PrerenderLocalPredictor;
 
 // PrerenderManager is responsible for initiating and keeping prerendered
 // views of web pages. All methods must be called on the UI thread unless
 // indicated otherwise.
-class PrerenderManager : public base::SupportsWeakPtr<PrerenderManager>,
-                         public content::NotificationObserver,
+class PrerenderManager : public content::NotificationObserver,
                          public content::RenderProcessHostObserver,
                          public KeyedService,
                          public MediaCaptureDevicesDispatcher::Observer {
  public:
   // NOTE: New values need to be appended, since they are used in histograms.
   enum PrerenderManagerMode {
     PRERENDER_MODE_DISABLED = 0,
     PRERENDER_MODE_ENABLED = 1,
     PRERENDER_MODE_EXPERIMENT_CONTROL_GROUP = 2,
     PRERENDER_MODE_EXPERIMENT_PRERENDER_GROUP = 3,
@@ skipping 495 matching lines @@
   // PrerenderManager is attached to.
   int64_t profile_network_bytes_;
 
   // The value of profile_network_bytes_ that was last recorded.
   int64_t last_recorded_profile_network_bytes_;
 
   // Set of process hosts being prerendered.
   using PrerenderProcessSet = std::set<content::RenderProcessHost*>;
   PrerenderProcessSet prerender_process_hosts_;
 
+  base::WeakPtrFactory<PrerenderManager> weak_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(PrerenderManager);
 };
 
 }  // namespace prerender
 
 #endif  // CHROME_BROWSER_PRERENDER_PRERENDER_MANAGER_H_