Remove Explicit Shapes Enablement in Tests

LayoutTests/fast/shapes/resources/multi-segment-polygon.js

 function generatePolygon(width, height, fontSize, points, content, elementId) {
-    if (window.internals)
-        window.internals.settings.setCSSExclusionsEnabled(true);
     var div = createOrInsert(elementId);
     var polygon = points.map(function(elem, index, array) {
         return elem.toString() + 'px' + (index < array.length - 1 && index % 2 == 1 ? ',' : '');
     }).join(' ');
     polygon = 'polygon(' + polygon + ')';
     div.style.setProperty('-webkit-shape-inside', polygon);
     div.style.setProperty('width', width + 'px');
     div.style.setProperty('height', height + 'px');
     div.style.setProperty('font', fontSize + 'px/1 Ahem, sans-serif');
     div.style.setProperty('color', 'green');
@@ skipping 18 matching lines @@
     if (elementId)
         return document.getElementById(elementId);
 
     var div = document.createElement('div');
     if (document.body.childNodes.length)
         docuemnt.body.insertBefore(div, document.body.childNodes[0]);
     else
         document.body.appendChild(div);
     return div;
 }