Get rid of multiple inheritence for SVGViewElement interface

LayoutTests/svg/dom/SVGViewSpec-defaults-expected.txt

Index: LayoutTests/svg/dom/SVGViewSpec-defaults-expected.txt
diff --git a/LayoutTests/svg/dom/SVGViewSpec-defaults-expected.txt b/LayoutTests/svg/dom/SVGViewSpec-defaults-expected.txt
index fda9f5ce7b1fd8b142983afe243383efde7910d9..001adbefda48c2f812a8146459e1229d2d4adca4 100644
--- a/LayoutTests/svg/dom/SVGViewSpec-defaults-expected.txt
+++ b/LayoutTests/svg/dom/SVGViewSpec-defaults-expected.txt
@@ -7,7 +7,7 @@ On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE
 Check initial SVGSVGElement.currentView values on a SVGSVGElement
 PASS currentView.transform.numberOfItems is 0
 PASS currentView.viewTarget is null
-PASS currentView.zoomAndPan is SVGZoomAndPan.SVG_ZOOMANDPAN_MAGNIFY
+PASS currentView.zoomAndPan is SVGViewElement.SVG_ZOOMANDPAN_MAGNIFY
 PASS currentView.viewBox.baseVal.x is 0
 PASS currentView.viewBox.baseVal.y is 0
 PASS currentView.viewBox.baseVal.width is 0
@@ -18,11 +18,11 @@ PASS currentView.viewBoxString is "0 0 0 0"
 PASS currentView.preserveAspectRatioString is "xMidYMid meet"
 PASS currentView.transformString is ""
 PASS currentView.viewTargetString is ""
-PASS currentView.zoomAndPan is SVGZoomAndPan.SVG_ZOOMANDPAN_MAGNIFY
+PASS currentView.zoomAndPan is SVGViewElement.SVG_ZOOMANDPAN_MAGNIFY
 
-Try changing zoomAndPan - none of these will work, as SVGViewSpec is fully readonly - even the animated properties it inherits from parent classes like SVGZoomAndPan/SVGFitToViewBox
-PASS currentView.zoomAndPan = SVGZoomAndPan.SVG_ZOOMANDPAN_DISABLE threw exception NoModificationAllowedError: An attempt was made to modify an object where modifications are not allowed..
-PASS currentView.zoomAndPan is SVGZoomAndPan.SVG_ZOOMANDPAN_MAGNIFY
+Try changing zoomAndPan - none of these will work, as SVGViewSpec is fully readonly - even the animated properties it inherits from supplmental classes like SVGViewElement/SVGFitToViewBox
+PASS currentView.zoomAndPan = SVGViewElement.SVG_ZOOMANDPAN_DISABLE threw exception NoModificationAllowedError: An attempt was made to modify an object where modifications are not allowed..
+PASS currentView.zoomAndPan is SVGViewElement.SVG_ZOOMANDPAN_MAGNIFY
 
 Try changing viewBox - this has no affect on the SVGSVGElement the viewSpec belongs to - it exposed all its properties as read-only
 PASS currentView.viewBox.baseVal.x = 10 threw exception NoModificationAllowedError: An attempt was made to modify an object where modifications are not allowed..