Follow changes in CR-css-flexbox-1-20160526

See also: https://www.w3.org/TR/2016/CR-css-flexbox-1-20160526/

test/test.css

@@ -222,7 +222,6 @@
   flex: column-reverse;
   flex-grow: wrap;
   flex-shrink: wrap-reverse;
-  flex-basis: main-size;
 }
 
 .font-loading-3 {

test/test.html

@@ -251,7 +251,6 @@
   flex: column-reverse;
   flex-grow: wrap;
   flex-shrink: wrap-reverse;
-  flex-basis: main-size;
 }
 </style>
 <style>