Implement deletion of storage per site.

chrome/browser/ui/webui/settings/site_settings_handler.h

Index: chrome/browser/ui/webui/settings/site_settings_handler.h
diff --git a/chrome/browser/ui/webui/settings/site_settings_handler.h b/chrome/browser/ui/webui/settings/site_settings_handler.h
index f4ad68ea739cb8e8abdc2404a931732d4d70b434..ebbc878c0906413d0609b7dab494678530d303d5 100644
--- a/chrome/browser/ui/webui/settings/site_settings_handler.h
+++ b/chrome/browser/ui/webui/settings/site_settings_handler.h
@@ -30,12 +30,16 @@ class SiteSettingsHandler
 
   // StorageInfoFetcher::Observer:
   void OnGetUsageInfo(const storage::UsageInfoEntries& entries) override;
+  void OnUsageInfoCleared() override;
 
  private:
   // Asynchronously fetches the usage for a given origin. Replies back with
   // OnGetUsageInfo above.
   void HandleFetchUsageTotal(const base::ListValue* args);
 
+  // Deletes the storage being used for a given host.
+  void HandleClearUsage(const base::ListValue* args);
+
   Profile* profile_;
 
   // The host for which to fetch usage.