Don't send a refactoring feedback in case of a fatal initial problem.

R=brianwilkerson@google.com, danrubel@google.com
BUG=

Review URL: https://codereview.chromium.org//793373004

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@42350 260f80e4-7a28-3924-810f-c04153c831b5
Turn on incremental resolution.

R=brianwilkerson@google.com
BUG=

Review URL: https://codereview.chromium.org//798083002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@42351 260f80e4-7a28-3924-810f-c04153c831b5
Fix error introduced by added import

Review URL: https://codereview.chromium.org//803663003

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@42353 260f80e4-7a28-3924-810f-c04153c831b5