Spec compliant url.search/url.hash setters over empty values.

LayoutTests/fast/domurl/url-search.html

Index: LayoutTests/fast/domurl/url-search.html
diff --git a/LayoutTests/fast/domurl/url-search.html b/LayoutTests/fast/domurl/url-search.html
index 9aeb0c580c81e89ceada1249ed885c33ebc43096..79e169d3442da168958544a381140ed6aaa707eb 100644
--- a/LayoutTests/fast/domurl/url-search.html
+++ b/LayoutTests/fast/domurl/url-search.html
@@ -16,9 +16,11 @@ test(function() {
 
     url.search = '';
     assert_equals(url.search, '');
+    assert_equals(url.toString(), 'http://www.domain.com/');
 
     url.search = '?';
     assert_equals(url.search, '');
+    assert_equals(url.toString(), 'http://www.domain.com/');
 
     url.search = 'a';
     assert_equals(url.search, '?a');