Unprefix flexbox tests.

LayoutTests/css3/flexbox/flex-flow-margins-auto-size.html

Index: LayoutTests/css3/flexbox/flex-flow-margins-auto-size.html
diff --git a/LayoutTests/css3/flexbox/flex-flow-margins-auto-size.html b/LayoutTests/css3/flexbox/flex-flow-margins-auto-size.html
index f941b77c1fdc2a095369843c5d7b1ddc831f15ce..e6e5f1c4971cf06d4439a6256b797a7cf8f6a7a2 100644
--- a/LayoutTests/css3/flexbox/flex-flow-margins-auto-size.html
+++ b/LayoutTests/css3/flexbox/flex-flow-margins-auto-size.html
@@ -8,7 +8,7 @@
     display: inline-block;
 }
 .flexbox {
-    display: -webkit-flex;
+    display: flex;
     background-color: grey;
     margin: 10px 20px 30px 40px;
 }
@@ -34,16 +34,16 @@
     -webkit-writing-mode: vertical-lr;
 }
 .row {
-    -webkit-flex-flow: row;
+    flex-flow: row;
 }
 .row-reverse {
-    -webkit-flex-flow: row-reverse;
+    flex-flow: row-reverse;
 }
 .column {
-    -webkit-flex-flow: column;
+    flex-flow: column;
 }
 .column-reverse {
-    -webkit-flex-flow: column-reverse;
+    flex-flow: column-reverse;
 }
 .flexbox > div {
     margin: 13px 2px 17px 8px;
@@ -79,7 +79,7 @@ writingModes.forEach(function(writingMode) {
             container.setAttribute('data-expected-height', 90);
 
             container.innerHTML = '<div class="flexbox ' + flexboxClassName + '" ' + flexboxExpectations + '>\n' +
-                '<div style="-webkit-flex: 1 auto; width: 20px; height: 20px;" ' + flexItemExpectations + '></div>\n' +
+                '<div style="flex: 1 auto; width: 20px; height: 20px;" ' + flexItemExpectations + '></div>\n' +
             '</div>';
 
             document.body.appendChild(container);