Move counters for passwords, history and autofill to components

chrome/browser/browsing_data/media_licenses_counter.h

 // Copyright 2016 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_MEDIA_LICENSES_COUNTER_H_
 #define CHROME_BROWSER_BROWSING_DATA_MEDIA_LICENSES_COUNTER_H_
 
 #include <set>
 #include <string>
 
@@ skipping 20 matching lines @@
 
     const std::string& GetOneOrigin() const;
 
    private:
     std::string one_origin_;
   };
 
   explicit MediaLicensesCounter(Profile* profile);
   ~MediaLicensesCounter() override;
 
+  const std::string& GetPrefName() const override;
+
  private:
+  const std::string pref_name_;
   Profile* profile_;
 
   // BrowsingDataCounter implementation.
   void Count() final;
 
   // Determining the set of origins used by the plugin private filesystem is
   // done asynchronously. This callback returns the results, which are
   // subsequently reported.
   void OnContentLicensesObtained(const std::set<GURL>& origins);
 
   base::WeakPtrFactory<MediaLicensesCounter> weak_ptr_factory_;
 };
 
 #endif  // CHROME_BROWSER_BROWSING_DATA_MEDIA_LICENSES_COUNTER_H_