capture and log server unhandled exception

BUG=
R=scheglov@google.com

Review URL: https://codereview.chromium.org//546103003

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@39944 260f80e4-7a28-3924-810f-c04153c831b5
remove unused DartMarkerAnnotation, old ErrorCode, and related classes and methods

BUG=
R=scheglov@google.com

Review URL: https://codereview.chromium.org//547943002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@39945 260f80e4-7a28-3924-810f-c04153c831b5