Unprefix flexbox tests.

LayoutTests/css3/flexbox/position-absolute-children.html

Index: LayoutTests/css3/flexbox/position-absolute-children.html
diff --git a/LayoutTests/css3/flexbox/position-absolute-children.html b/LayoutTests/css3/flexbox/position-absolute-children.html
index 2f232ce879e7e07605e792749d2e7869ebfd9b24..fd3a45eeeca09e41273572f702c855a217e3877a 100644
--- a/LayoutTests/css3/flexbox/position-absolute-children.html
+++ b/LayoutTests/css3/flexbox/position-absolute-children.html
@@ -10,13 +10,13 @@ body {
 }
 
 .flexbox {
-    display: -webkit-flex;
+    display: flex;
     background-color: #aaa;
     position: relative;
 }
 .flexbox div {
     border: 0;
-    -webkit-flex: none;
+    flex: none;
 }
 
 .horizontal-tb {
@@ -33,16 +33,16 @@ body {
 }
 
 .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 :nth-child(1) {
@@ -60,19 +60,19 @@ body {
 }
 
 .justify-content-flex-start {
-    -webkit-justify-content: flex-start;
+    justify-content: flex-start;
 }
 .justify-content-flex-end {
-    -webkit-justify-content: flex-end;
+    justify-content: flex-end;
 }
 .justify-content-center {
-    -webkit-justify-content: center;
+    justify-content: center;
 }
 .justify-content-space-between {
-    -webkit-justify-content: space-between;
+    justify-content: space-between;
 }
 .justify-content-space-around {
-    -webkit-justify-content: space-around;
+    justify-content: space-around;
 }
 </style>
 <script src="../../resources/check-layout.js"></script>