Build fix. Remove the now duplicate OS check and add PublicDOMInterfaces.h to the dependancy list for ObjC DOM files.
Build fix. Remove the now duplicate OS check and add PublicDOMInterfaces.h to the dependancy list for ObjC DOM files.

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@16228 bbb929c8-8fbe-4397-9dbb-9b2b20218538
axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk