Removed undetectable style.filter.

Removed undetectable style.filter.

Reviewed by Sam Weinig.

This feature was added in http://trac.webkit.org/changeset/15557 to
support housingmaps.com. But housingmaps.com no longer needs this hack,
we don't know of other websites that need it, and we don't know of
any other browsers that have implemented this feature.

Source/JavaScriptCore:

* GNUmakefile.list.am:
* JavaScriptCore.gypi:
* JavaScriptCore.vcproj/JavaScriptCore/JavaScriptCore.vcproj:
* JavaScriptCore.xcodeproj/project.pbxproj:
* runtime/JSTypeInfo.h:
* runtime/StringObjectThatMasqueradesAsUndefined.h: Removed.

Source/WebCore:

* ForwardingHeaders/runtime/StringObjectThatMasqueradesAsUndefined.h: Removed.
* WebCore.order:
* bindings/js/JSCSSStyleDeclarationCustom.cpp:
(WebCore::JSCSSStyleDeclaration::nameGetter):

LayoutTests:

* fast/dom/undetectable-style-filter-expected.txt: Removed.
* fast/dom/undetectable-style-filter.html: Removed.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@95331 268f45cc-cd09-0410-ab3c-d52691b4dbfc