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..7288db4edec7c9070797f57212afd2b8c85cd0f4 100644
--- a/chrome/browser/ui/webui/settings/site_settings_handler.h
+++ b/chrome/browser/ui/webui/settings/site_settings_handler.h
@@ -30,17 +30,24 @@ class SiteSettingsHandler
 
   // StorageInfoFetcher::Observer:
   void OnGetUsageInfo(const storage::UsageInfoEntries& entries) override;
+  void OnUsageInfoCleared(storage::QuotaStatusCode code) 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.
   std::string usage_host_;
 
+  // The origin for which to clear usage.
+  std::string clearing_origin_;
+
   // The helper object asynchronously fetching storage info.
   scoped_refptr<StorageInfoFetcher> storage_info_fetcher_;