Remove last usage functions from HostContentSettingsMap and clean up prefs

chrome/browser/permissions/permission_context_base.cc

 // Copyright 2014 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.
 
 #include "chrome/browser/permissions/permission_context_base.h"
 
 #include <stddef.h>
 
 #include <string>
 #include <utility>
@@ skipping 91 matching lines @@
     NotifyPermissionSet(id, requesting_origin, embedding_origin, callback,
                         false /* persist */, CONTENT_SETTING_BLOCK);
     return;
   }
 
   // Synchronously check the content setting to see if the user has already made
   // a decision, or if the origin is under embargo. If so, respect that
   // decision.
   ContentSetting content_setting =
       GetPermissionStatus(requesting_origin, embedding_origin);
-  if (content_setting == CONTENT_SETTING_ALLOW) {
-    HostContentSettingsMapFactory::GetForProfile(profile_)->UpdateLastUsage(
-        requesting_origin, embedding_origin, content_settings_storage_type());
-  }
 
   if (content_setting == CONTENT_SETTING_ALLOW ||
       content_setting == CONTENT_SETTING_BLOCK) {
     NotifyPermissionSet(id, requesting_origin, embedding_origin, callback,
                         false /* persist */, content_setting);
     return;
   }
 
   // Asynchronously check whether the origin should be blocked from making this
   // permission request. It may be on the Safe Browsing API blacklist, or it may
@@ skipping 246 matching lines @@
                                       content_settings_storage_type(),
                                       std::string(), content_setting);
 }
 
 ContentSettingsType PermissionContextBase::content_settings_storage_type()
     const {
   if (content_settings_type_ == CONTENT_SETTINGS_TYPE_PUSH_MESSAGING)
     return CONTENT_SETTINGS_TYPE_NOTIFICATIONS;
   return content_settings_type_;
 }