Remove support for <animateColor>.

LayoutTests/svg/animations/script-tests/animate-currentColor.js

 description("Tests animation on 'currentColor'.");
 createSVGTestCase();
 
 // Setup test document
 var rect = createSVGElement("rect");
 rect.setAttribute("id", "rect");
 rect.setAttribute("width", "100px");
 rect.setAttribute("height", "100px");
 rect.setAttribute("fill", "red");
 rect.setAttribute("color", "green");
 rect.setAttribute("onclick", "executeTest()");
 
-var animateCurrentColor = createSVGElement("animateColor");
+var animateCurrentColor = createSVGElement("animate");
 animateCurrentColor.setAttribute("id", "animateCurrentColor");
 animateCurrentColor.setAttribute("attributeName", "fill");
 animateCurrentColor.setAttribute("from", "red");
 animateCurrentColor.setAttribute("to", "currentColor");
 animateCurrentColor.setAttribute("dur", "3s");
 animateCurrentColor.setAttribute("begin", "click");
 animateCurrentColor.setAttribute("fill", "freeze");
 rect.appendChild(animateCurrentColor);
 rootSVGElement.appendChild(rect);
 
@@ skipping 19 matching lines @@
         ["animateCurrentColor", 0.0, sample1],
         ["animateCurrentColor", 1.5, sample2],
         ["animateCurrentColor", 3.0, sample3]
     ];
 
     runAnimationTest(expectedValues);
 }
 
 var successfullyParsed = true;