Add CompletionHandler and HashCountedSet to wtf/Forward.h
Created attachment 323560 [details]
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] 
Total errors found: 1 in 3 files
If any of these errors are false positives, please file a bug against check-webkit-style.