https://bugs.webkit.org/show_bug.cgi?id=103905

Reviewed by Simon Fraser.

Source/JavaScriptCore:

Turn the flag on by default.

* Configurations/FeatureDefines.xcconfig:

Source/WebCore:

Turn the flag on by default.

No new tests : covered by tests landed previously.

* Configurations/FeatureDefines.xcconfig:
* css/CSSToStyleMap.cpp:
(WebCore::CSSToStyleMap::mapFillXPosition): Build fix in release on Mac with unused variable.
(WebCore::CSSToStyleMap::mapFillYPosition): Ditto.

Source/WebKit/mac:

Turn the flag on by default.

* Configurations/FeatureDefines.xcconfig:

Source/WebKit2:

Turn the flag on by default.

* Configurations/FeatureDefines.xcconfig:

LayoutTests:

Enable by default the new CSS3 background position offsets therefore we
can unskip the tests.

* platform/mac/TestExpectations:


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@136415 268f45cc-cd09-0410-ab3c-d52691b4dbfc