Bug 1218315 - Replace NS_LITERAL_STRING(...).get() with MOZ_UTF16(...) on rdf. r=nfroyd

rdf/datasource/nsFileSystemDataSource.cpp

@@ -333,7 +333,7 @@ FileSystemDataSource::GetTarget(nsIRDFResource *source,
             url->GetValueConst(&uni);
             if (!uni)   return(NS_RDF_NO_VALUE);
             nsAutoString    urlStr;
-            urlStr.Assign(NS_LITERAL_STRING(NS_MOZICON_SCHEME).get());
+            urlStr.AssignLiteral(NS_MOZICON_SCHEME);
             urlStr.Append(uni);
 
             rv = mRDFService->GetLiteral(urlStr.get(), getter_AddRefs(url));