Bug 1400406 - js/xpconnect/moz.build contains a reference to a non-existent directory. r=gps

Also, MOZ_XPCTOOLS does not appear to be a thing any more.

MozReview-Commit-ID: 99BR9rl4EnD

--HG--
extra : rebase_source : 3712b7b2b180b583ca761cdc5d6ddf17728e8b74

js/xpconnect/moz.build

@@ -10,7 +10,3 @@ with Files('**'):
 DIRS += ['public', 'idl', 'wrappers', 'loader', 'src']
 DIRS += ['shell']
 TEST_DIRS += ['tests']
-
-if CONFIG['MOZ_XPCTOOLS']:
-    DIRS += ['tools']
-