XPCOM #include changes

[Doug Turner]

I removed some of the implicit include statements from some of the
public xpcom headers. I have fixed up all places in the mozilla tree
which utilized this implicit include, but in case I missed some or you
have your own projects using these headers, here is what you may have to
include:

One (or more) of the following files:

nsComObsolete.h
nsISupportsObsolete.h
nsDebug.h (unlikely)

The tracking bug for this change was:

http://bugzilla.mozilla.org/show_bug.cgi?id=166917



Thanks,

Doug Turner
***@netscape.com