Use LocalStyleChange for element cursor changes in SVG.

third_party/WebKit/LayoutTests/svg/css/cursor-change-href.svg

+<svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
+    <g style="cursor:url(#cursor), auto">
+        <g>
+            <rect id="rect" x="50" y="50" width="100" height="100" fill="green" />
+            <text id="result1" x="50" y="200">Not run.</text>
+            <text id="result2" x="50" y="220">Not run.</text>
+        </g>
+    </g>
+    <cursor id="cursor" xlink:href="file:///icon1.ico" x="0" y="0" />
+    <script>
+        // Modifying href of a cursor element should cause a recalc of elements using it.
+
+        if (window.testRunner)
+            testRunner.dumpAsText();
+
+        var rect = document.getElementById("rect");
+        var result1 = document.getElementById("result1").firstChild;
+        var result2 = document.getElementById("result2").firstChild;
+
+        if (getComputedStyle(rect).cursor == "url(\"file:///icon1.ico\"), auto")
+            result1.data = "PASS";
+        else
+            result1.data = "FAIL - " + getComputedStyle(rect).cursor;
+
+        document.getElementById("cursor").setAttribute("xlink:href", "file:///icon2.ico");
+
+        if (getComputedStyle(rect).cursor == "url(\"file:///icon2.ico\"), auto")
+            result2.data = "PASS";
+        else
+            result2.data = "FAIL - " + getComputedStyle(rect).cursor;
+    </script>
+</svg>