[Chromium] Update some #includes for WebMessagePortChannel.h
https://bugs.webkit.org/show_bug.cgi?id=111752

Reviewed by James Robinson.

In anticipation of removing
WK/chromium/public/WebMessagePortChannel.h (once all downstream
references have been updated)

* public/WebDOMMessageEvent.h:
* public/WebFrame.h:
* public/WebSharedWorkerClient.h:


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@145125 268f45cc-cd09-0410-ab3c-d52691b4dbfc