Add a hook to clear Gears Plugin Data in the "Clear browsing data" tool.

chrome/browser/browsing_data_remover.h

Index: chrome/browser/browsing_data_remover.h
diff --git a/chrome/browser/browsing_data_remover.h b/chrome/browser/browsing_data_remover.h
index a563c9a689bb7c216987a671e3f1f8550ec69d7c..ba50151e80cec7fa9013caf38826c391632b70df 100644
--- a/chrome/browser/browsing_data_remover.h
+++ b/chrome/browser/browsing_data_remover.h
@@ -91,6 +91,9 @@ class BrowsingDataRemover : public NotificationObserver,
 
   static bool is_removing() { return removing_; }
 
+  // Removes the Gears plugin data.
+  static void ClearGearsData(const FilePath& profile_dir);
+
  private:
   enum CacheState {
     STATE_NONE,
@@ -158,6 +161,12 @@ class BrowsingDataRemover : public NotificationObserver,
   void OnAppCacheDeleted(int rv);
   ChromeAppCacheService* GetAppCacheService();
 
+  // Callback when Gears data has been deleted. Invokes NotifyAndDeleteIfDone.
+  void OnClearedGearsData();
+
+  // Invoked on the FILE thread to delete old Gears data.
+  void ClearGearsDataOnFILEThread(const FilePath& profile_dir);
+
   // Calculate the begin time for the deletion range specified by |time_period|.
   base::Time CalculateBeginDeleteTime(TimePeriod time_period);
 
@@ -167,7 +176,7 @@ class BrowsingDataRemover : public NotificationObserver,
            !waiting_for_clear_history_ &&
            !waiting_for_clear_networking_history_ &&
            !waiting_for_clear_databases_ && !waiting_for_clear_appcache_ &&
-           !waiting_for_clear_lso_data_;
+           !waiting_for_clear_lso_data_ && !waiting_for_clear_gears_data_;
   }
 
   NotificationRegistrar registrar_;
@@ -218,6 +227,7 @@ class BrowsingDataRemover : public NotificationObserver,
   bool waiting_for_clear_cache_;
   bool waiting_for_clear_appcache_;
   bool waiting_for_clear_lso_data_;
+  bool waiting_for_clear_gears_data_;
 
   ObserverList<Observer> observer_list_;