Remove last usage functions from HostContentSettingsMap and clean up prefs

components/content_settings/core/browser/content_settings_pref.h

 // Copyright 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 COMPONENTS_CONTENT_SETTINGS_CORE_BROWSER_CONTENT_SETTINGS_PREF_H_
 #define COMPONENTS_CONTENT_SETTINGS_CORE_BROWSER_CONTENT_SETTINGS_PREF_H_
 
 #include <stddef.h>
 
 #include <string>
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/synchronization/lock.h"
 #include "base/threading/thread_checker.h"
 #include "base/values.h"
 #include "components/content_settings/core/browser/content_settings_origin_identifier_value_map.h"
 #include "components/content_settings/core/browser/content_settings_provider.h"
 #include "components/content_settings/core/common/content_settings_pattern.h"
 #include "components/content_settings/core/common/content_settings_types.h"
 
 class PrefService;
 class PrefChangeRegistrar;
 
 namespace base {
-class Clock;
 class DictionaryValue;
 }
 
 namespace content_settings {
 
 class RuleIterator;
 
 // Represents a single pref for reading/writing content settings of one type.
 class ContentSettingsPref {
  public:
@@ skipping 17 matching lines @@
 
   bool SetWebsiteSetting(const ContentSettingsPattern& primary_pattern,
                          const ContentSettingsPattern& secondary_pattern,
                          const ResourceIdentifier& resource_identifier,
                          base::Value* value);
 
   void ClearPref();
 
   void ClearAllContentSettingsRules();
 
-  void UpdateLastUsage(const ContentSettingsPattern& primary_pattern,
-                       const ContentSettingsPattern& secondary_pattern,
-                       base::Clock* clock);
-
-  base::Time GetLastUsage(const ContentSettingsPattern& primary_pattern,
-                          const ContentSettingsPattern& secondary_pattern);
-
   size_t GetNumExceptions();
 
   // Tries to lock |lock_|. If successful, returns true and releases the lock.
   bool TryLockForTesting() const;
 
  private:
   // Reads all content settings exceptions from the preference and loads them
   // into the |value_map_|. The |value_map_| is cleared first.
   void ReadContentSettingsFromPref();
 
@@ skipping 46 matching lines @@
   mutable base::Lock lock_;
 
   base::ThreadChecker thread_checker_;
 
   DISALLOW_COPY_AND_ASSIGN(ContentSettingsPref);
 };
 
 }  // namespace content_settings
 
 #endif  // COMPONENTS_CONTENT_SETTINGS_CORE_BROWSER_CONTENT_SETTINGS_PREF_H_