Simplify the support string in the Clear Browsing Data dialog.

chrome/browser/ui/webui/options/clear_browser_data_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_CLEAR_BROWSER_DATA_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_OPTIONS_CLEAR_BROWSER_DATA_HANDLER_H_
 
 #include "base/memory/scoped_vector.h"
 #include "base/prefs/pref_member.h"
 #include "chrome/browser/browsing_data/browsing_data_counter.h"
 #include "chrome/browser/browsing_data/browsing_data_remover.h"
+#include "chrome/browser/sync/profile_sync_service.h"
 #include "chrome/browser/ui/webui/options/options_ui.h"
 
 namespace options {
 
 // Clear browser data handler page UI handler.
 class ClearBrowserDataHandler : public OptionsPageUIHandler,
-                                public BrowsingDataRemover::Observer {
+                                public BrowsingDataRemover::Observer,
+                                public sync_driver::SyncServiceObserver {
  public:
   ClearBrowserDataHandler();
   ~ClearBrowserDataHandler() override;
 
   // OptionsPageUIHandler implementation.
   void GetLocalizedValues(base::DictionaryValue* localized_strings) override;
   void InitializeHandler() override;
   void InitializePage() override;
 
   // WebUIMessageHandler implementation.
@@ skipping 18 matching lines @@
 
   // Updates the counter of the pref |pref_name| in the UI according
   // to a callback from a |BrowsingDataCounter| that specifies whether
   // the counting has |finished| and what the |count| is. The |count| will
   // be substituted into the string with the ID |text_grd_id|.
   void UpdateCounterText(const std::string& pref_name,
                          int text_grd_id,
                          bool finished,
                          uint32 count);
 
+  // Implementation of SyncServiceObserver. Updates the support string at the
+  // bottom of the dialog.
+  void OnStateChanged() override;
+
   // If non-null it means removal is in progress. BrowsingDataRemover takes care
   // of deleting itself when done.
   BrowsingDataRemover* remover_;
 
   // 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_;
 
   // Counters that calculate the data volume for some of the data types.
   ScopedVector<BrowsingDataCounter> counters_;
 
+  // Informs us whether the user is syncing their data.
+  ProfileSyncService* sync_service_;
+
   DISALLOW_COPY_AND_ASSIGN(ClearBrowserDataHandler);
 };
 
 }  // namespace options
 
 #endif  // CHROME_BROWSER_UI_WEBUI_OPTIONS_CLEAR_BROWSER_DATA_HANDLER_H_