Remove new check that crashes on android.

Check was added in r38499

BUG=dartbug.com/20181
R=ricow@google.com

Review URL: https://codereview.chromium.org//424693002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@38603 260f80e4-7a28-3924-810f-c04153c831b5