Add support for unregistering web intents default by service_url.

chrome/browser/webdata/web_intents_table.h

Index: chrome/browser/webdata/web_intents_table.h
diff --git a/chrome/browser/webdata/web_intents_table.h b/chrome/browser/webdata/web_intents_table.h
index 0f737da91b5d1e5bb4af0a97e235921badef043f..4fa1f1acadeb2e089a14354a232a736c9cacdcf0 100644
--- a/chrome/browser/webdata/web_intents_table.h
+++ b/chrome/browser/webdata/web_intents_table.h
@@ -105,6 +105,9 @@ class WebIntentsTable : public WebDatabaseTable {
   // and url_pattern parameters exactly.
   bool RemoveDefaultService(const DefaultWebIntentService& default_service);
 
+  // Removes all default services associated with |service_url|.
+  bool RemoveServiceDefaults(const GURL& service_url);
+
  private:
   DISALLOW_COPY_AND_ASSIGN(WebIntentsTable);
 };