Reviewed by Simon Fraser.

        compositing/objects/composited-object-alignment.html causing failures in other tests since its introduction in r83518
        https://bugs.webkit.org/show_bug.cgi?id=58323

        Got rid of unnecessary JS from composited-subframe.html. This was mistakenly left in from previous experiments.
        Also moved pixel results to be platform specific. These are for Mac WebKit and WebKit2. There are color diffs
        between the two platforms, so I will make them all platform specific.

        * compositing/framesets/composited-frame-alignment-expected.checksum: Removed.
        * compositing/framesets/composited-frame-alignment-expected.png: Removed.
        * compositing/objects/composited-object-alignment-expected.checksum: Removed.
        * compositing/objects/composited-object-alignment-expected.png: Removed.
        * compositing/objects/resources/composited-subframe.html:
        * platform/mac-wk2/compositing: Added.
        * platform/mac-wk2/compositing/framesets: Added.
        * platform/mac-wk2/compositing/framesets/composited-frame-alignment-expected.checksum: Added.
        * platform/mac-wk2/compositing/framesets/composited-frame-alignment-expected.png: Added.
        * platform/mac-wk2/compositing/objects: Added.
        * platform/mac-wk2/compositing/objects/composited-object-alignment-expected.checksum: Added.
        * platform/mac-wk2/compositing/objects/composited-object-alignment-expected.png: Added.
        * platform/mac/compositing/framesets: Added.
        * platform/mac/compositing/framesets/composited-frame-alignment-expected.checksum: Added.
        * platform/mac/compositing/framesets/composited-frame-alignment-expected.png: Added.
        * platform/mac/compositing/objects: Added.
        * platform/mac/compositing/objects/composited-object-alignment-expected.checksum: Copied from LayoutTests/compositing/objects/composited-object-alignment-expected.checksum.
        * platform/mac/compositing/objects/composited-object-alignment-expected.png: Copied from LayoutTests/compositing/objects/composited-object-alignment-expected.png.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@83756 268f45cc-cd09-0410-ab3c-d52691b4dbfc