Report HintCode.UNUSED_ELEMENT for functions.

1 positive in dart2js
1 positive in analysis_server
0 positives in analyzer

R=brianwilkerson@google.com
BUG=

Review URL: https://codereview.chromium.org//725163004

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@41746 260f80e4-7a28-3924-810f-c04153c831b5
Date.now() return an int

BUG=
R=floitsch@google.com

Review URL: https://codereview.chromium.org//723823003

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@41747 260f80e4-7a28-3924-810f-c04153c831b5
Fix formatter breakage.

Constants are special.

R=paulberry@google.com
BUG=

Review URL: https://codereview.chromium.org//724093007

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@41748 260f80e4-7a28-3924-810f-c04153c831b5