Handle multipart MIME parsing with no parts
Handle multipart MIME parsing with no parts

The multipart MIME parser did not correctly handle the case where there
was only the final boundary.

R=kustermann@google.com
BUG=

Review URL: https://codereview.chromium.org//739533002

git-svn-id: 1c5c434d27865ebf805f1872291744e919f7ad6a@41805 260f80e4-7a28-3924-810f-c04153c831b5

dart-archive/http_server