Unprefix flexbox tests.

LayoutTests/css3/flexbox/nested-stretch.html

Index: LayoutTests/css3/flexbox/nested-stretch.html
diff --git a/LayoutTests/css3/flexbox/nested-stretch.html b/LayoutTests/css3/flexbox/nested-stretch.html
index 6076d6a92b1a075eeef5cac199414ecef28f75cc..8f345c33e8a2df38b05ff10727469d2b94ad582d 100644
--- a/LayoutTests/css3/flexbox/nested-stretch.html
+++ b/LayoutTests/css3/flexbox/nested-stretch.html
@@ -10,20 +10,20 @@ div {
 }
 
 .flexbox {
-  display: -webkit-flex; 
+  display: flex; 
 }
 
 .row {
-  -webkit-flex-direction: row;
+  flex-direction: row;
 }
 
 .column {
-  display: -webkit-flex; 
-  -webkit-flex-direction: column;
+  display: flex; 
+  flex-direction: column;
 }
 
 .flex {
-  -webkit-flex: 1 0 auto;
+  flex: 1 0 auto;
 }
 </style>
 <script src="../../resources/check-layout.js"></script>
@@ -45,11 +45,11 @@ height on the right.
 
 None of the boxes should overflow and the inner most boxes should be end aligned.
 <div class="flexbox column" style="width: 600px; height: 300px; position: relative;">
-  <div data-expected-width=590 data-expected-height=250 class="column flex" style="-webkit-justify-content: flex-end">
-    <div data-offset-y="180" data-expected-width=570 data-expected-height=30 style="height: 20px; -webkit-flex: none;"></div>
-    <div data-offset-y="220" data-expected-width=570 data-expected-height=30 style="height: 20px; -webkit-flex: none;"></div>
+  <div data-expected-width=590 data-expected-height=250 class="column flex" style="justify-content: flex-end">
+    <div data-offset-y="180" data-expected-width=570 data-expected-height=30 style="height: 20px; flex: none;"></div>
+    <div data-offset-y="220" data-expected-width=570 data-expected-height=30 style="height: 20px; flex: none;"></div>
   </div>
-  <div data-expected-width=590 data-expected-height=30 style="height: 20px; -webkit-flex: none;"></div>
+  <div data-expected-width=590 data-expected-height=30 style="height: 20px; flex: none;"></div>
 </div>