Add CompletionHandler and HashCountedSet to wtf/Forward.h
Created attachment 323560 [details] Patch
Attachment 323560 [details] did not pass style-queue: ERROR: Source/WTF/wtf/Forward.h:43: More than one command on the same line [whitespace/newline] [4] Total errors found: 1 in 3 files If any of these errors are false positives, please file a bug against check-webkit-style.
http://trac.webkit.org/r223258
<rdar://problem/34963969>