Bug 831669: Move SVGClipPathElement to mozilla::dom r=bz

--HG--
rename : content/svg/content/src/nsSVGClipPathElement.cpp => content/svg/content/src/SVGClipPathElement.cpp
rename : content/svg/content/src/nsSVGClipPathElement.h => content/svg/content/src/SVGClipPathElement.h
Bug 831669 - Convert SVGClipPathElement to WebIDL r=bz
Bug 832011: nsDOMTokenList should QI to nsISupports r=bz