Add support for unregistering web intents default by service_url.

chrome/browser/webdata/web_intents_table.cc

Index: chrome/browser/webdata/web_intents_table.cc
diff --git a/chrome/browser/webdata/web_intents_table.cc b/chrome/browser/webdata/web_intents_table.cc
index 561e24dec89ae48f444b197336a27201ebf785be..7f3ffa551ca830f6d18f52328c321ace9dc1b174 100644
--- a/chrome/browser/webdata/web_intents_table.cc
+++ b/chrome/browser/webdata/web_intents_table.cc
@@ -323,3 +323,11 @@ bool WebIntentsTable::RemoveDefaultService(
 
   return s.Run();
 }
+
+bool WebIntentsTable::RemoveServiceDefaults(const GURL& service_url) {
+  sql::Statement s(db_->GetUniqueStatement(
+      "DELETE FROM web_intents_defaults WHERE service_url = ?"));
+  s.BindString(0, service_url.spec());
+
+  return s.Run();
+}