IndexedDB: Add --level-db flag, and pipe through to WebIDBFactory::open.

chrome/renderer/renderer_webidbfactory_impl.cc

Index: chrome/renderer/renderer_webidbfactory_impl.cc
diff --git a/chrome/renderer/renderer_webidbfactory_impl.cc b/chrome/renderer/renderer_webidbfactory_impl.cc
index 5efa5520303f4e8271e6e01d5a71965c2ab1a423..d44f1155c678aa111d7820e1833566c7b4b52392 100644
--- a/chrome/renderer/renderer_webidbfactory_impl.cc
+++ b/chrome/renderer/renderer_webidbfactory_impl.cc
@@ -29,7 +29,8 @@ void RendererWebIDBFactoryImpl::open(
     const WebSecurityOrigin& origin,
     WebFrame* web_frame,
     const WebString& data_dir,
-    unsigned long long maximum_size) {
+    unsigned long long maximum_size,
+    WebKit::WebIDBFactory::BackingStoreImpl) {
   // Don't send the data_dir. We know what we want on the Browser side of
   // things.
   IndexedDBDispatcher* dispatcher =