Remove old tests that have been migrated to the v8 repo.

LayoutTests/fast/js/script-tests/exception-properties.js

-description("Test for correct properties on Error objects.");
-
-function enumerableProperties(object)
-{
-    var result = [];
-    for (var i in object)
-        result.push(i);
-    return result;
-}
-
-try {
-    // generate a RangeError.
-    [].length = -1;
-} catch (rangeError) {
-    var nativeError = rangeError;
-    var error = new Error("message");
-
-    shouldBe('enumerableProperties(error)', '[]');
-    shouldBe('enumerableProperties(nativeError)', '["stack", "line", "sourceURL"]');
-
-    shouldBe('Object.getPrototypeOf(nativeError).name', '"RangeError"');
-    shouldBe('Object.getPrototypeOf(nativeError).message', '""');
-}