Remove unnecessary forward declarations of MessagePortChannel, MessagePortChannelArray in DumpRenderTreeSupportEfl.h
https://bugs.webkit.org/show_bug.cgi?id=127654

Reviewed by Alexey Proskuryakov.

* WebCoreSupport/DumpRenderTreeSupportEfl.h: Remove the forward declarations of MessagePortChannel
and MessagePortChannelArray. They were most likely at one point used in DRT support methods, but are
not necessary anymore.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@162930 268f45cc-cd09-0410-ab3c-d52691b4dbfc