Reverted r158538.

* Shared/Cocoa/WKNSArray.mm:
(-[WKNSArray copyWithZone:]):
* Shared/Cocoa/WKNSDictionary.mm:
(-[WKNSDictionary copyWithZone:]):
* Shared/ImmutableArray.h:



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@158552 268f45cc-cd09-0410-ab3c-d52691b4dbfc