Decouple the browsing data counters initialization and start.

chrome/browser/browsing_data/browsing_data_counter.h

 // Copyright (c) 2015 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_BROWSING_DATA_BROWSING_DATA_COUNTER_H_
 #define CHROME_BROWSER_BROWSING_DATA_BROWSING_DATA_COUNTER_H_
 
 #include <string>
 
 #include "base/callback.h"
@@ skipping 11 matching lines @@
   // Should be called once to initialize this class.
   void Init(Profile* profile,
             const Callback& callback);
 
   // Name of the preference associated with this counter.
   virtual const std::string& GetPrefName() const = 0;
 
   // The profile associated with this counter.
   Profile* GetProfile() const;
 
+  // Restarts the counter. Will be called automatically if the counting needs
+  // to be restarted, e.g. when the deletion preference changes state or when
+  // we are notified of data changes.
+  void Restart();
+
  protected:
-  // Called when some conditions have changed and the counting should be
-  // restarted, e.g. when the deletion preference changed state or when
-  // we were notified of data changes.
-  void RestartCounting();
-
   // Should be called from |Count| by any overriding class to indicate that
   // counting is finished and report the |result|.
   void ReportResult(uint32 result);
 
   // Calculates the beginning of the counting period as |period_| before now.
   base::Time GetPeriodStart();
 
  private:
   // Called after the class is initialized by calling |Init|.
   virtual void OnInitialized();
@@ skipping 14 matching lines @@
 
   // The integer preference describing the time period for which this data type
   // is to be deleted.
   IntegerPrefMember period_;
 
   // Whether this class was properly initialized by calling |Init|.
   bool initialized_ = false;
 };
 
 #endif  // CHROME_BROWSER_BROWSING_DATA_BROWSING_DATA_COUNTER_H_