Unprefix flexbox tests.

LayoutTests/css3/flexbox/flexitem.html

Index: LayoutTests/css3/flexbox/flexitem.html
diff --git a/LayoutTests/css3/flexbox/flexitem.html b/LayoutTests/css3/flexbox/flexitem.html
index 0bfc2158fd024e6c12cffc60952c3524b16071d7..b2a312130bba38ed226d17773f57657b652cd0f0 100644
--- a/LayoutTests/css3/flexbox/flexitem.html
+++ b/LayoutTests/css3/flexbox/flexitem.html
@@ -133,12 +133,12 @@
 
 <!-- tests that images can shrink below their CSS height with min-height: min-content -->
 <div class="flexbox column" style="height:50px">
-    <img data-expected-height="50" style="-webkit-flex-shrink:1;height:1000px;min-height:-webkit-min-content;" src="../images/resources/blue-10.png">
+    <img data-expected-height="50" style="flex-shrink:1;height:1000px;min-height:-webkit-min-content;" src="../images/resources/blue-10.png">
 </div>
 
 <!-- tests that text can shrink below its CSS height with min-height: min-content -->
 <div class="flexbox column" style="height:50px">
-    <div data-expected-height="50" style="-webkit-flex-shrink:1;height:1000px;min-height:-webkit-min-content;" src="../images/resources/blue-10.png">
+    <div data-expected-height="50" style="flex-shrink:1;height:1000px;min-height:-webkit-min-content;" src="../images/resources/blue-10.png">
       Some text<br>
       Some more text
     </div>
@@ -146,7 +146,7 @@
 
 <!-- tests that images can shrink below their CSS width with min-width: min-content -->
 <div class="flexbox" style="width:50px">
-    <img data-expected-width="50" style="-webkit-flex-shrink:1;width:1000px;min-width:-webkit-min-content;" src="../images/resources/blue-10.png">
+    <img data-expected-width="50" style="flex-shrink:1;width:1000px;min-width:-webkit-min-content;" src="../images/resources/blue-10.png">
 </div>
 
 <!-- tests that min-width expands the width of flex items beyond the width of the flexbox -->