Consolidates accessing and setting the UMA pref to be within metrics code

chrome/browser/ui/webui/options/core_options_handler.h

 // Copyright (c) 2012 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_UI_WEBUI_OPTIONS_CORE_OPTIONS_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_OPTIONS_CORE_OPTIONS_HANDLER_H_
 
 #include <map>
 #include <string>
 
@@ skipping 142 matching lines @@
 
   // Callback for the "coreOptionsUserMetricsAction" message.  This records
   // an action that should be tracked if metrics recording is enabled. |args|
   // is an array that contains a single item, the name of the metric identifier.
   void HandleUserMetricsAction(const base::ListValue* args);
 
   // Callback for the "disableExtension" message. The extension ID string is the
   // only argument in the |args| list.
   void HandleDisableExtension(const base::ListValue* args);
 
+  void HandleMetricsReportingChange(const base::ListValue* args);
+  void MetricsReportingChangeCallback(bool success);
+
   void UpdateClearPluginLSOData();
   void UpdatePepperFlashSettingsEnabled();
 
   OptionsPageUIHandlerHost* handlers_host_;
   // This registrar keeps track of user prefs.
   PrefChangeRegistrar registrar_;
   // This registrar keeps track of local state.
   PrefChangeRegistrar local_state_registrar_;
 
   PluginStatusPrefSetter plugin_status_pref_setter_;
 
   // This maps pref names to filter functions. The callbacks should take the
   // value that the user has attempted to set for the pref, and should return
   // true if that value may be applied. If the return value is false, the
   // change will be ignored.
   typedef std::map<std::string, base::Callback<bool(const base::Value*)> >
       PrefChangeFilterMap;
   PrefChangeFilterMap pref_change_filters_;
 
   DISALLOW_COPY_AND_ASSIGN(CoreOptionsHandler);
 };
 
 }  // namespace options
 
 #endif  // CHROME_BROWSER_UI_WEBUI_OPTIONS_CORE_OPTIONS_HANDLER_H_