[CSS Grid Layout] Update grid-auto-flow to the new syntax

LayoutTests/fast/css-grid-layout/grid-auto-flow-update.html

Index: LayoutTests/fast/css-grid-layout/grid-auto-flow-update.html
diff --git a/LayoutTests/fast/css-grid-layout/grid-auto-flow-update.html b/LayoutTests/fast/css-grid-layout/grid-auto-flow-update.html
index aeb3d4edc7aaa7520deb5ac10ed6c0df87ddf4ae..c8521f6713755e185186d8774d7966f39d7dd804 100644
--- a/LayoutTests/fast/css-grid-layout/grid-auto-flow-update.html
+++ b/LayoutTests/fast/css-grid-layout/grid-auto-flow-update.html
@@ -25,10 +25,11 @@ function updateAutoFlow()
 {
     checkLayout(".grid");
 
-    testGrid("row", { 'offsetX': '50', 'offsetY': '0', 'width': '100', 'height': '50' });
     testGrid("column", { 'offsetX': '0', 'offsetY': '50', 'width': '50', 'height': '100' });
-    testGrid("invalid", { 'offsetX': '0', 'offsetY': '50', 'width': '50', 'height': '100' });
-    testGrid("none", { 'offsetX': '0', 'offsetY': '0', 'width': '50', 'height': '50' });
+    testGrid("stack", { 'offsetX': '0', 'offsetY': '0', 'width': '50', 'height': '50' });
+    testGrid("", { 'offsetX': '50', 'offsetY': '0', 'width': '100', 'height': '50' });
+    testGrid("invalid", { 'offsetX': '50', 'offsetY': '0', 'width': '100', 'height': '50' });
+    testGrid("none", { 'offsetX': '50', 'offsetY': '0', 'width': '100', 'height': '50' });
 }
 window.addEventListener("load", updateAutoFlow, false);
 </script>
@@ -36,7 +37,7 @@ window.addEventListener("load", updateAutoFlow, false);
 <div>This test checks that updating the grid's element's grid-auto-flow property recomputes the grid.</div>
 <div style="position: relative">
     <div class="grid">
-        <div class="sizedToGridArea autoRowAutoColumn" id="autoItem" data-offset-x="0" data-offset-y="0" data-expected-width="50" data-expected-height="50"></div>
+        <div class="sizedToGridArea autoRowAutoColumn" id="autoItem" data-offset-x="50" data-offset-y="0" data-expected-width="100" data-expected-height="50"></div>
         <div class="sizedToGridArea firstRowFirstColumn" data-offset-x="0" data-offset-y="0" data-expected-width="50" data-expected-height="50"></div>
     </div>
 </div>