Bug 514664 - Remove (now) useless MOZ_ENABLE_COCOA; (Av1-MC) Just remove it

r=ted.mielczarek

config/autoconf.mk.in

@@ -514,7 +514,6 @@ MOZ_ENABLE_CAIRO_FT	= @MOZ_ENABLE_CAIRO_FT@
 MOZ_ENABLE_GTK2		= @MOZ_ENABLE_GTK2@
 MOZ_ENABLE_QT		= @MOZ_ENABLE_QT@
 MOZ_ENABLE_PHOTON	= @MOZ_ENABLE_PHOTON@
-MOZ_ENABLE_COCOA	= @MOZ_ENABLE_COCOA@
 MOZ_ENABLE_XREMOTE	= @MOZ_ENABLE_XREMOTE@
 
 MOZ_GTK2_CFLAGS		= @MOZ_GTK2_CFLAGS@

configure.in

@@ -4875,7 +4875,6 @@ cairo-os2)
 cairo-cocoa)
     MOZ_WIDGET_TOOLKIT=cocoa
     AC_DEFINE(MOZ_WIDGET_COCOA)
-    MOZ_ENABLE_COCOA=1
     MOZ_USER_DIR="Mozilla"
     AC_DEFINE(XP_MACOSX)
     AC_DEFINE(TARGET_CARBON)
@@ -4991,7 +4990,6 @@ AC_SUBST(TK_LIBS)
 
 AC_SUBST(MOZ_ENABLE_GTK2)
 AC_SUBST(MOZ_ENABLE_PHOTON)
-AC_SUBST(MOZ_ENABLE_COCOA)
 AC_SUBST(MOZ_ENABLE_QT)
 AC_SUBST(MOZ_ENABLE_XREMOTE)
 AC_SUBST(MOZ_GTK2_CFLAGS)