[css-grid] refactoring of layout tests

third_party/WebKit/LayoutTests/fast/css-grid-layout/resources/grid.css

 .grid {
     display: grid;
     background-color: grey;
 }
 
-.indefiniteSizeGrid {
-    display: grid;
-    background-color: grey;
-    width: -webkit-min-content;
-    height: auto;
-}
-
 .inline-grid {
     display: inline-grid;
     background-color: grey;
 }
 
 .firstRowFirstColumn {
     background-color: blue;
     grid-column: 1;
     grid-row: 1;
 }
@@ skipping 238 matching lines @@
 }
 
 .sizedToGridArea {
     font: 10px/1 Ahem;
     /* Make us fit our grid area. */
     width: 100%;
     height: 100%;
 }
 
 .verticalRL {
+    writing-mode: vertical-rl;
     -webkit-writing-mode: vertical-rl;

[Manuel Rego, 2015/12/02 09:31:02]

Usually you write this the other way around.

First "-webkit-writing-mode" and later "writing-mode".

So I'd change it to:
.verticalRL {
    -webkit-writing-mode: vertical-rl;
    writing-mode: vertical-rl;
}

If the unprefixed one is implemented, we prefer that one instead of the prefixed
one.

 }
-
 .verticalLR {
+    writing-mode: vertical-lr;
     -webkit-writing-mode: vertical-lr;

[Manuel Rego, 2015/12/02 09:31:02]

Ditto.

 }
-
+.horizontalTB {
+    writing-mode: horizontal-tb;
+    -webkit-writing-mode: horizontal-tb;

[Manuel Rego, 2015/12/02 09:31:02]

Ditto.

+}
+.horizontalBT {
+    writing-mode: horizontal-bt;
+    -webkit-writing-mode: horizontal-bt;

[Manuel Rego, 2015/12/02 09:31:02]

Ditto.

+}
 .directionRTL {
     direction: rtl;
 }
-
 .directionLTR {
     direction: ltr;
 }
+
+

[Manuel Rego, 2015/12/02 09:31:02]

Nit: Unneeded extra lines.