Continue removing testing of getPropertyCSSValue

LayoutTests/fast/css/inherited-properties-explicit.html

 <script src="../../resources/js-test.js"></script>
 <script>
 if (window.testRunner)
     testRunner.dumpAsText();
 </script>
 <style>
 .a { margin-left:5px; }
 .b { margin-left:inherit; }
 .c { margin-left:10px; }
 </style>
@@ skipping 20 matching lines @@
     <div class=a>
         <div class="b c" id=test3b></div>
     </div>
 </div>
 <p>
 Test that the matched declaration cache handles explicitly inherited properties correctly.
 <p>
 <script>
 function test(e, p) {
     var testDiv = document.getElementById(e);
-    var cssValue = window.getComputedStyle(testDiv).getPropertyCSSValue(p);
-    return cssValue.cssText;
+    return getComputedStyle(testDiv).marginLeft;
 }
-shouldBeEqualToString("test('test1a', 'margin-left')", "0px");
-shouldBeEqualToString("test('test1b', 'margin-left')", "0px");
-shouldBeEqualToString("test('test2a', 'margin-left')", "5px");
-shouldBeEqualToString("test('test2b', 'margin-left')", "5px");
-shouldBeEqualToString("test('test3a', 'margin-left')", "10px");
-shouldBeEqualToString("test('test3b', 'margin-left')", "10px");
+shouldBeEqualToString("test('test1a')", "0px");
+shouldBeEqualToString("test('test1b')", "0px");
+shouldBeEqualToString("test('test2a')", "5px");
+shouldBeEqualToString("test('test2b')", "5px");
+shouldBeEqualToString("test('test3a')", "10px");
+shouldBeEqualToString("test('test3b')", "10px");
 </script>