[chromium] Remove WebCompositorFrame(Ack) as these classes are not needed now that they are passed through cc::OutputSurface. https://bugs.webkit.org/show_bug.cgi?id=104635 Reviewed by James Robinson. These have been supplanted by cc::CompositorFrame(Ack) which do not need to inherit from them. * chromium/public/WebCompositorFrame.h: Removed. * chromium/public/WebCompositorFrameAck.h: Removed. git-svn-id: https://svn.webkit.org/repository/webkit/trunk/Source/Platform/chromium/public@137258 268f45cc-cd09-0410-ab3c-d52691b4dbfc