Drop [TreatNullAs=NullString] for Document.cookie

third_party/WebKit/LayoutTests/http/tests/cookies/js-set-null.html

Index: third_party/WebKit/LayoutTests/http/tests/cookies/js-set-null.html
diff --git a/third_party/WebKit/LayoutTests/http/tests/cookies/http-get-cookie-set-in-js.html b/third_party/WebKit/LayoutTests/http/tests/cookies/js-set-null.html
similarity index 59%
copy from third_party/WebKit/LayoutTests/http/tests/cookies/http-get-cookie-set-in-js.html
copy to third_party/WebKit/LayoutTests/http/tests/cookies/js-set-null.html
index ab8eb4d8bfc97424d86320e242e6b7a578f85ae6..4216bef72baee5cd74d93f8602e7f0cf0ddef25c 100644
--- a/third_party/WebKit/LayoutTests/http/tests/cookies/http-get-cookie-set-in-js.html
+++ b/third_party/WebKit/LayoutTests/http/tests/cookies/js-set-null.html
@@ -8,16 +8,13 @@
 <p id="description"></p>
 <div id="console"></div>
 <script>
-description(
-'Test that a cookie set using JavaScript can be correctly read by HTTP server'
-);
+description("Setting document.cookie to null should set a cookie named 'null'");
 
 clearAllCookies();
 
-document.cookie = "name=value;Max-Age=1000";
-
-debug('checking that the cookie set in javascript can be read by HTTP server');
-testCookies("name=value");
+document.cookie = null;
+shouldBe("document.cookie", "'null'");
+testCookies("null");
 
 clearCookies();