[CSS Grid Layout] Rename grid-{rows|columns} to grid-definition-{rows|columns}

LayoutTests/fast/css-grid-layout/flex-and-minmax-content-resolution-columns.html

Index: LayoutTests/fast/css-grid-layout/flex-and-minmax-content-resolution-columns.html
diff --git a/LayoutTests/fast/css-grid-layout/flex-and-minmax-content-resolution-columns.html b/LayoutTests/fast/css-grid-layout/flex-and-minmax-content-resolution-columns.html
index bb71bfeec1154afa87ebc988de49909c7a209732..61c5397b0bcfee9ab96b870361dd3e4cb95b26a3 100644
--- a/LayoutTests/fast/css-grid-layout/flex-and-minmax-content-resolution-columns.html
+++ b/LayoutTests/fast/css-grid-layout/flex-and-minmax-content-resolution-columns.html
@@ -7,28 +7,28 @@ if (window.testRunner)
 <link href="resources/grid.css" rel="stylesheet">
 <style>
 .gridMaxMaxContent {
-    grid-columns: minmax(10px, -webkit-max-content) minmax(10px, 1fr);
-    grid-rows: 50px;
+    grid-definition-columns: minmax(10px, -webkit-max-content) minmax(10px, 1fr);
+    grid-definition-rows: 50px;
 }
 
 .gridMinMinContent {
-    grid-columns: minmax(10px, 1fr) minmax(-webkit-min-content, 50px);
-    grid-rows: 50px;
+    grid-definition-columns: minmax(10px, 1fr) minmax(-webkit-min-content, 50px);
+    grid-definition-rows: 50px;
 }
 
 .gridWithIntrinsicSizeBiggerThanFlex {
-    grid-columns: minmax(-webkit-min-content, 0.5fr) minmax(18px, 2fr);
-    grid-rows: 50px;
+    grid-definition-columns: minmax(-webkit-min-content, 0.5fr) minmax(18px, 2fr);
+    grid-definition-rows: 50px;
 }
 
 .gridShrinkBelowItemsIntrinsicSize {
-    grid-columns: minmax(0px, 1fr) minmax(0px, 2fr);
-    grid-rows: 50px;
+    grid-definition-columns: minmax(0px, 1fr) minmax(0px, 2fr);
+    grid-definition-rows: 50px;
 }
 
 .gridWithNonFlexingItems {
-    grid-columns: 40px minmax(-webkit-min-content, 1fr) auto minmax(20px, 2fr);
-    grid-rows: 50px;
+    grid-definition-columns: 40px minmax(-webkit-min-content, 1fr) auto minmax(20px, 2fr);
+    grid-definition-rows: 50px;
 }
 
 .firstRowThirdColumn {