Removed bogus ASSERT.

LOG=y
BUG=347542
R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/183763007

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@19592 ce2b1a6d-e550-0410-aec6-3dcde31c8c00