Remove Explicit Shapes Enablement in Tests

LayoutTests/fast/shapes/resources/simple-polygon.js

 // The functions in this file are intended to be used to test non-complex polygons
 // where horizontal lines that overlap the polygon only cross the polygon twice.
-if (window.internals)
-    window.internals.settings.setCSSExclusionsEnabled(true);
-
 function createPolygon(vertices) {
     var xCoordinates = vertices.map( function(p) { return p.x; } );
     var yCoordinates = vertices.map( function(p) { return p.y; } );
     return {
         vertices: vertices,
         minX: Math.min.apply(null, xCoordinates),
         maxX: Math.max.apply(null, xCoordinates),
         minY: Math.min.apply(null, yCoordinates),
         maxY: Math.max.apply(null, yCoordinates)
     };
@@ skipping 225 matching lines @@
     positionInformativeText("informative-text", stylesheet, polygon, lineHeight)
 }
 
 function createPolygonShapeInsideTestCaseExpected() {
     var stylesheet = document.getElementById("stylesheet").sheet;
     var polygon = createPolygon(vertices);
     generateSimulatedPolygonShapeInsideElement("polygon-shape-inside", stylesheet, polygon, lineHeight);
     generatePolygonSVGElements("polygon-svg-shape", stylesheet, polygon, lineHeight);
     positionInformativeText("informative-text", stylesheet, polygon, lineHeight)
 }