MD Settings: Clear Browsing Data dialog, dismiss when clearing is done.

chrome/browser/ui/webui/settings/settings_clear_browsing_data_handler.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 CHROME_BROWSER_UI_WEBUI_SETTINGS_SETTINGS_CLEAR_BROWSING_DATA_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_SETTINGS_SETTINGS_CLEAR_BROWSING_DATA_HANDLER_H_
 
 #include "base/macros.h"
 #include "base/memory/scoped_vector.h"
 #include "chrome/browser/browsing_data/browsing_data_remover.h"
@@ skipping 15 matching lines @@
 class ClearBrowsingDataHandler : public SettingsPageUIHandler,
                                  public BrowsingDataRemover::Observer {
  public:
   explicit ClearBrowsingDataHandler(content::WebUI* webui);
   ~ClearBrowsingDataHandler() override;
 
   // OptionsPageUIHandler:
   void RegisterMessages() override;
 
  private:
-  // Javascript callback to start clearing data.
-  void HandleClearBrowserData(const base::ListValue* value);
+  // Clears browsing data, called by Javascript.
+  void HandleClearBrowsingData(const base::ListValue* value);
 
   // BrowsingDataRemover::Observer implementation.
   // Re-enables clear button once all requested data has been removed.
   void OnBrowsingDataRemoverDone() override;
 
   // Updates UI when the pref to allow clearing history changes.
   virtual void OnBrowsingHistoryPrefChanged();
 
   // If non-null it means removal is in progress.
   BrowsingDataRemover* remover_;
 
+  // The WebUI callback ID of the last performClearBrowserData request. There
+  // can only be one such request in-flight.
+  std::string webui_callback_id_;
+
   // Keeps track of whether clearing LSO data is supported.
   BooleanPrefMember clear_plugin_lso_data_enabled_;
 
   // Keeps track of whether Pepper Flash is enabled and thus Flapper-specific
   // settings and removal options (e.g. Content Licenses) are available.
   BooleanPrefMember pepper_flash_settings_enabled_;
 
   // Keeps track of whether deleting browsing history and downloads is allowed.
   BooleanPrefMember allow_deleting_browser_history_;
 
   DISALLOW_COPY_AND_ASSIGN(ClearBrowsingDataHandler);
 };
 
 }  // namespace settings
 
 #endif  // CHROME_BROWSER_UI_WEBUI_SETTINGS_SETTINGS_CLEAR_BROWSING_DATA_HANDLER_H_