[MD settings] disable clear browsing data while it is running

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 <memory>
+#include <string>
 #include <vector>
 
 #include "base/macros.h"
 #include "base/scoped_observer.h"
 #include "chrome/browser/browsing_data/browsing_data_remover.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/webui/settings/settings_page_ui_handler.h"
 #include "components/browser_sync/browser/profile_sync_service.h"
 #include "components/browsing_data/counters/browsing_data_counter.h"
 #include "components/prefs/pref_change_registrar.h"
@@ skipping 19 matching lines @@
   // WebUIMessageHandler implementation.
   void RegisterMessages() override;
   void OnJavascriptAllowed() override;
   void OnJavascriptDisallowed() override;
 
  private:
   // 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 OnBrowsingDataRemoving(bool is_removing) override;
   void OnBrowsingDataRemoverDone() override;
 
   // Updates UI when the pref to allow clearing history changes.
   virtual void OnBrowsingHistoryPrefChanged();
 
   // Initializes the dialog UI. Called by JavaScript when the DOM is ready.
   void HandleInitialize(const base::ListValue* args);
 
   // Implementation of SyncServiceObserver. Updates the footer of the dialog
   // when the sync state changes.
@@ skipping 23 matching lines @@
   Profile* profile_;
 
   // Counters that calculate the data volume for individual data types.
   std::vector<std::unique_ptr<browsing_data::BrowsingDataCounter>> counters_;
 
   // ProfileSyncService to observe sync state changes.
   ProfileSyncService* sync_service_;
   ScopedObserver<ProfileSyncService, sync_driver::SyncServiceObserver>
       sync_service_observer_;
 
-  // If non-null it means removal is in progress.
+  // Observe the remover progress.
   BrowsingDataRemover* remover_;
+  ScopedObserver<BrowsingDataRemover, BrowsingDataRemover::Observer>
+      remover_observer_;
 
   // The WebUI callback ID of the last performClearBrowserData request. There
   // can only be one such request in-flight.
   std::string webui_callback_id_;
 
   // Used to listen for pref changes to allow / disallow deleting browsing data.
   PrefChangeRegistrar profile_pref_registrar_;
 
   // Whether the sentence about other forms of history stored in user's account
   // should be displayed in the footer. This value is retrieved asynchronously,
   // so we cache it here.
   bool show_history_footer_;
 
   // Whether we should show a dialog informing the user about other forms of
   // history stored in their account after the history deletion is finished.
   bool show_history_deletion_dialog_;
 
   // A weak pointer factory for asynchronous calls referencing this class.
   base::WeakPtrFactory<ClearBrowsingDataHandler> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ClearBrowsingDataHandler);
 };
 
 }  // namespace settings
 
 #endif  // CHROME_BROWSER_UI_WEBUI_SETTINGS_SETTINGS_CLEAR_BROWSING_DATA_HANDLER_H_