Get rid of multiple inheritence for SVGViewElement interface

LayoutTests/svg/dom/script-tests/SVGViewSpec.js

 description("This test checks the SVGViewSpec API, operating on a parsed viewSpec");
 if (window.testRunner)
     testRunner.waitUntilDone();
 
 function completeTest() {
     var script = document.createElement("script");
 
     script.onload = function() {
         if (window.testRunner)
             testRunner.notifyDone();
@@ skipping 53 matching lines @@
     shouldBe("currentView.transform.getItem(4).angle", "0");
     shouldBeEqualToString("matrixToString(currentView.transform.getItem(4).matrix)", "[0.70 0.00 0.00 0.70 0.00 0.00]");
 
     debug("");
     debug("Check viewTarget value");
     shouldBeEqualToString("currentView.viewTargetString", "blub");
     shouldBeNull("currentView.viewTarget"); // There's no element named 'blub' in the tree.
 
     debug("");
     debug("Check zoomAndPan value");
-    shouldBe("currentView.zoomAndPan", "SVGZoomAndPan.SVG_ZOOMANDPAN_DISABLE");
+    shouldBe("currentView.zoomAndPan", "SVGViewElement.SVG_ZOOMANDPAN_DISABLE");
 
     debug("");
     debug("Check viewBox value");
     shouldBe("currentView.viewBox.baseVal.x", "0");
     shouldBe("currentView.viewBox.baseVal.y", "0");
     shouldBe("currentView.viewBox.baseVal.width", "100");
     shouldBe("currentView.viewBox.baseVal.height", "50");
     shouldBeEqualToString("currentView.viewBoxString", "0 0 100 50");
 
     debug("");
     debug("Check preserveAspectRatio value");
     shouldBeEqualToString("currentView.preserveAspectRatioString", "xMinYMid slice");
     shouldBe("currentView.preserveAspectRatio.baseVal.align", "SVGPreserveAspectRatio.SVG_PRESERVEASPECTRATIO_XMINYMID");
     shouldBe("currentView.preserveAspectRatio.baseVal.meetOrSlice", "SVGPreserveAspectRatio.SVG_MEETORSLICE_SLICE");
 
     completeTest();
 }
 
 testFragment("svgView(viewBox(0,0,100,50);preserveAspectRatio(xMinYMid slice);transform(translate(0 10) translate(25 25) rotate(45) translate(-25 -25) scale(0.7 0.7));viewTarget(blub);zoomAndPan(disable))");
 successfullyParsed = true;