Unreviewed gardening; rebaseline mac expected results after r147470.

* platform/mac/css3/filters/effect-reference-composite-expected.png: Added.
* platform/mac/css3/filters/effect-reference-composite-expected.txt: Added.
* platform/mac/css3/filters/effect-reference-composite-hw-expected.png: Added.
* platform/mac/css3/filters/effect-reference-composite-hw-expected.txt: Added.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@147518 268f45cc-cd09-0410-ab3c-d52691b4dbfc