Revert SVG-related APIs from DOMWindowSVG.idl back to DOMWindow.idl

Revert SVG-related APIs from DOMWindowSVG.idl back to DOMWindow.idl
https://bugs.webkit.org/show_bug.cgi?id=80139

Reviewed by Adam Barth.

Based on the discussion on webkit-dev@
(http://markmail.org/message/kagvswmah67zmrry#query:+page:1+mid:h34vzbiu5suub3ld+state:results),
this patch reverts SVG-related APIs from DOMWindowSVG.idl back to DOMWindow.idl.

No tests. No change in behavior.

* CMakeLists.txt:
* DerivedSources.make:
* DerivedSources.pri:
* GNUmakefile.list.am:
* WebCore.gypi:
* WebCore.xcodeproj/project.pbxproj:
* page/DOMWindow.idl:
* svg/DOMWindowSVG.idl: Removed.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@109693 268f45cc-cd09-0410-ab3c-d52691b4dbfc