[CSS Grid Layout] Adapting align-self, align-items and justify-self to the last CSS 3 spec.

LayoutTests/fast/alignment/resources/alignment-parsing-utils.js

Index: LayoutTests/fast/alignment/resources/alignment-parsing-utils.js
diff --git a/LayoutTests/fast/alignment/resources/alignment-parsing-utils.js b/LayoutTests/fast/alignment/resources/alignment-parsing-utils.js
index 4670fc8fd6795d728370861b7459f9820bdcd057..7d88793ec77e297df8798706def49a47215c48bd 100644
--- a/LayoutTests/fast/alignment/resources/alignment-parsing-utils.js
+++ b/LayoutTests/fast/alignment/resources/alignment-parsing-utils.js
@@ -8,7 +8,7 @@ function checkValues(element, property, propertyID, value, computedValue)
 
 function checkBadValues(element, property, propertyID, value)
 {
-    element.style.justifyItems = value;
+    element.style[property] = value;
     checkValues(element, property, propertyID, "", "start");
 }
 
@@ -20,9 +20,9 @@ function checkInitialValues(element, property, propertyID, display, value)
       initial = "stretch";
     }
 
-    element.style.justifyItems = value;
+    element.style[property] = value;
     checkValues(element, property, propertyID, value, value);
-    element.style.justifyItems = "initial";
+    element.style[property] = "initial";
     checkValues(element, property, propertyID, "initial", initial);
 }
 
@@ -30,19 +30,19 @@ function checkInheritValues(element, property, propertyID, value)
 {
     parentElement = document.createElement("div");
     document.body.appendChild(parentElement);
-    parentElement.style.justifyItems = value;
+    parentElement.style[property] = value;
     checkValues(parentElement, property, propertyID, value, value);
 
     element = document.createElement("div");
     parentElement.appendChild(element);
-    element.style.justifyItems = "inherit";
+    element.style[property] = "inherit";
     checkValues(element, property, propertyID, "inherit", value);
 }
 
 function checkLegacyValues(element, property, propertyID, value)
 {
     document.body.appendChild(parentElement);
-    parentElement.style.justifyItems = value;
+    parentElement.style[property] = value;
     checkValues(parentElement, property, propertyID, value, value);
 
     element = document.createElement("div");