Fix a traverse bug. In loop node, the init part was skipped in traversing. BUG= TEST= R=kbr@chromium.org Review URL: https://codereview.appspot.com/14366043 Change-Id: If3200f1dbcafda1147820b2d47b758b897de0fc6 Reviewed-on: https://chromium-review.googlesource.com/178992 Reviewed-by: Shannon Woods <shannonwoods@chromium.org> Tested-by: Shannon Woods <shannonwoods@chromium.org>