Unreviewed roll out of r157695; broke Mac builds.

Source/WebCore:

* Configurations/FeatureDefines.xcconfig:

Source/WebKit/mac:

* Configurations/FeatureDefines.xcconfig:

Source/WebKit2:

* Configurations/FeatureDefines.xcconfig:

Source/WTF:

* wtf/FeatureDefines.h:

LayoutTests:

* platform/mac/js/dom/global-constructors-attributes-expected.txt: Removed.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@157697 268f45cc-cd09-0410-ab3c-d52691b4dbfc