Fix and re-enable PrerenderTaskManager test

chrome/browser/task_manager/task_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_TASK_MANAGER_TASK_MANAGER_H_
 #define CHROME_BROWSER_TASK_MANAGER_TASK_MANAGER_H_
 
 #include <map>
 #include <vector>
 
@@ skipping 288 matching lines @@
   // don't spend unneeded time updating, unless we have a real need to.
   void StartListening();
   void StopListening();
 
   void Clear();  // Removes all items.
 
   // Sends OnModelChanged() to all observers to inform them of significant
   // changes to the model.
   void ModelChanged();
 
+   // Updates the values for all rows.
+  void Refresh();
+
   void NotifyResourceTypeStats(
         base::ProcessId renderer_id,
         const WebKit::WebCache::ResourceTypeStats& stats);
 
   void NotifyFPS(base::ProcessId renderer_id,
                  int routing_id,
                  float fps);
 
   void NotifyVideoMemoryUsageStats(
       const content::GPUVideoMemoryUsageStats& video_memory_usage_stats);
@@ skipping 124 matching lines @@
 
     int routing_id;
     int byte_count;
   };
 
   ~TaskManagerModel();
 
   // Callback from the timer to refresh. Invokes Refresh() as appropriate.
   void RefreshCallback();
 
-   // Updates the values for all rows.
-  void Refresh();
-
   void RefreshVideoMemoryUsageStats();
 
   // Returns the network usage (in bytes per seconds) for the specified
   // resource. That's the value retrieved at the last timer's tick.
   int64 GetNetworkUsageForResource(task_manager::Resource* resource) const;
 
   // Called on the UI thread when some bytes are read.
   void BytesRead(BytesReadParam param);
 
   void MultipleBytesRead(const std::vector<BytesReadParam>* params);
@@ skipping 98 matching lines @@
   // All per-Resource values are stored here.
   mutable PerResourceCache per_resource_cache_;
 
   // All per-Process values are stored here.
   mutable PerProcessCache per_process_cache_;
 
   DISALLOW_COPY_AND_ASSIGN(TaskManagerModel);
 };
 
 #endif  // CHROME_BROWSER_TASK_MANAGER_TASK_MANAGER_H_