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/178992Reviewed-by: Shannon Woods <shannonwoods@chromium.org>
Tested-by: Shannon Woods <shannonwoods@chromium.org>