Hold histograms in static variables instead of allocating heap.

chrome/browser/net/websocket_experiment/websocket_experiment_runner.h

 // Copyright (c) 2009 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_NET_WEBSOCKET_EXPERIMENT_WEBSOCKET_EXPERIMENT_RUNNER_H_
 #define CHROME_BROWSER_NET_WEBSOCKET_EXPERIMENT_WEBSOCKET_EXPERIMENT_RUNNER_H_
 
 #include "base/basictypes.h"
 #include "base/histogram.h"
 #include "base/linked_ptr.h"
@@ skipping 19 matching lines @@
     WebSocketExperimentTask::Config wss_config;
     WebSocketExperimentTask::Config ws_nondefault_config;
   };
   static void Start();
   static void Stop();
 
   void Run();
   void Cancel();
 
  private:
-  typedef std::map<std::string, linked_ptr<Histogram> > HistogramMap;
-
   enum State {
     STATE_NONE,
     STATE_IDLE,
     STATE_RUN_WS,
     STATE_RUN_WSS,
     STATE_RUN_WS_NODEFAULT_PORT,
   };
   WebSocketExperimentRunner();
   virtual ~WebSocketExperimentRunner();
   friend class base::RefCountedThreadSafe<WebSocketExperimentRunner>;
 
   void InitConfig();
-  void InitHistograms();
   void DoLoop();
   void OnTaskCompleted(int result);
   void UpdateTaskResultHistogram(const WebSocketExperimentTask* task);
 
-  template<class HistogramType, typename HistogramSample>
-  void InitHistogram(const char* type_name,
-                     HistogramSample min, HistogramSample max,
-                     size_t bucket_count);
-
-  Histogram* GetHistogram(const std::string& type_name) const;
-
   Config config_;
   State next_state_;
   State task_state_;
   scoped_ptr<WebSocketExperimentTask> task_;
   net::CompletionCallbackImpl<WebSocketExperimentRunner> task_callback_;
 
-  HistogramMap ws_histograms_;
-  HistogramMap wss_histograms_;
-  HistogramMap ws_nondefault_histograms_;
-
   DISALLOW_COPY_AND_ASSIGN(WebSocketExperimentRunner);
 };
 
 }  // namespace chrome_browser_net_websocket_experiment
 
 #endif  // CHROME_BROWSER_NET_WEBSOCKET_EXPERIMENT_WEBSOCKET_EXPERIMENT_RUNNER_H_