Avoid patching in dart2dart.

BUG=http://dartbug.com/21441
R=floitsch@google.com

Review URL: https://codereview.chromium.org//746993002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@41901 260f80e4-7a28-3924-810f-c04153c831b5
Fix the new dart2dart backend.

Revert some code accidentially introduced by https://codereview.chromium.org//726543002

BUG=
R=floitsch@google.com

Review URL: https://codereview.chromium.org//747923003

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@41902 260f80e4-7a28-3924-810f-c04153c831b5
Update status for enum_const_test.

BUG=

Review URL: https://codereview.chromium.org//751603002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@41904 260f80e4-7a28-3924-810f-c04153c831b5