Add a cache counter for iOS.

ios/chrome/browser/browsing_data/cache_counter.h

-// Copyright (c) 2015 The Chromium Authors. All rights reserved.
+// 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_CACHE_COUNTER_H_
-#define CHROME_BROWSER_BROWSING_DATA_CACHE_COUNTER_H_
-
-#include <stdint.h>
+#ifndef IOS_CHROME_BROWSER_BROWSING_DATA_CACHE_COUNTER_H_
+#define IOS_CHROME_BROWSER_BROWSING_DATA_CACHE_COUNTER_H_
 
 #include "base/memory/weak_ptr.h"
 #include "components/browsing_data/core/counters/browsing_data_counter.h"
 
-class Profile;
+namespace web {
+class BrowserState;
+}
 
 class CacheCounter : public browsing_data::BrowsingDataCounter {
  public:
-  explicit CacheCounter(Profile* profile);
+  explicit CacheCounter(web::BrowserState* browser_state);
   ~CacheCounter() override;
 
   // Whether this counter awaits the calculation result callback.
   // Used only for testing.
-  bool Pending();
+  bool pending() { return pending_; }
 
+  // BrowsingDataCounter implementation.
   const char* GetPrefName() const override;
 
  private:
-  Profile* profile_;
+  // BrowsingDataCounter implementation.
+  void Count() override;
+
+  void OnCacheSizeCalculated(int result_bytes);
+
   bool pending_;
 
+  web::BrowserState* browser_state_;
+
   base::WeakPtrFactory<CacheCounter> weak_ptr_factory_;
-
-  void Count() override;
-  void OnCacheSizeCalculated(int64_t bytes);
 };
 
-#endif  // CHROME_BROWSER_BROWSING_DATA_CACHE_COUNTER_H_
+#endif  // IOS_CHROME_BROWSER_BROWSING_DATA_CACHE_COUNTER_H_