Update comment after CL:1364970

The fix for bug 911609 obsoleted a comment about the affected JS code.
Let's update the comment too.

No-try: true
Bug: 873539, 911609
Change-Id: I2477ce8082724bd9ca3f2ab70cd169d6579b22e4
Reviewed-on: https://chromium-review.googlesource.com/c/1364971
Commit-Queue: Noel Gordon <noel@chromium.org>
Reviewed-by: Sam McNally <sammc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#614281}
1 file changed