Remove unused gNoComputedValue variable.

layout/style/test/test_value_storage.html

@@ -57,9 +57,6 @@ var gShorthandsWithoutCondensingSerialize = {
   "pause": true,
 };
 
-var gNoComputedValue = {
-};
-
 var gNotAccepted = {
   "-moz-column-width": [ "50%" ],
   "-moz-user-select": [ "auto" ],