Remove [TreatNullAs=NullString] from the 'dir' attribute on Document

third_party/WebKit/LayoutTests/fast/dom/document-dir-property.html

Index: third_party/WebKit/LayoutTests/fast/dom/document-dir-property.html
diff --git a/third_party/WebKit/LayoutTests/fast/dom/document-dir-property.html b/third_party/WebKit/LayoutTests/fast/dom/document-dir-property.html
index fce0786e48998b2a6584204d2962ef9e66fe7cfa..08b2700b7b3396c32b95a6013cc3ba041aba37e8 100644
--- a/third_party/WebKit/LayoutTests/fast/dom/document-dir-property.html
+++ b/third_party/WebKit/LayoutTests/fast/dom/document-dir-property.html
@@ -28,6 +28,10 @@ debug("Read document.documentElement.dir in body");
 shouldBeEqualToString("document.documentElement.dir", "rtl");
 debug("");
 
+debug("Read document.documentElement.getAttribute('dir') in body");
+shouldBeEqualToString("document.documentElement.getAttribute('dir')", "rtl");
+debug("");
+
 debug("Read document.body.dir in body");
 shouldBeEqualToString("document.body.dir", "");
 debug("");
@@ -45,16 +49,28 @@ debug("Read document.body.dir in body");
 shouldBeEqualToString("document.body.dir", "");
 debug("");
 
+debug("Read document.documentElement.getAttribute('dir') in body");
+shouldBeEqualToString("document.documentElement.getAttribute('dir')", "ltr");
+debug("");
+
 debug("Write non-canonical case document.dir in body");
 shouldNotThrow("document.dir = 'RTL'");
 shouldBeEqualToString("document.dir", "rtl");
 debug("");
 
+debug("Read document.documentElement.getAttribute('dir') in body");
+shouldBeEqualToString("document.documentElement.getAttribute('dir')", "RTL");
+debug("");
+
 debug("Write invalid document.dir in body");
 shouldNotThrow("document.dir = 'WRONG'");
 shouldBeEqualToString("document.dir", "");
 debug("");
 
+debug("Read document.documentElement.getAttribute('dir') in body");
+shouldBeEqualToString("document.documentElement.getAttribute('dir')", "WRONG");
+debug("");
+
 debug("Write non-canonical case document.body.dir in body");
 shouldNotThrow("document.body.dir = 'RTL'");
 shouldBeEqualToString("document.body.dir", "rtl");
@@ -64,6 +80,16 @@ debug("Write invalid document.body.dir in body");
 shouldNotThrow("document.body.dir = 'WRONG'");
 shouldBeEqualToString("document.body.dir", "");
 debug("");
+
+document.dir = null;
+debug("Read document.dir in body");
+shouldBeEqualToString("document.dir", "");
+debug("");
+
+debug("Read document.documentElement.getAttribute('dir') in body");
+shouldBeEqualToString("document.documentElement.getAttribute('dir')", "null");
+debug("");
+
 </script>
 </body>
 </html>