idl: Remove comment about _ in idl identifier

The way to handle '_' in identifier is described Web IDL spec.
We don't need a confusing comment as if it comes from our IDL compiler implementation.
https://heycam.github.io/webidl/#idl-names


Bug: 820353
Change-Id: Iba6c851daa6ae0dc6d690b220a5c757d507e4dc7
Reviewed-on: https://chromium-review.googlesource.com/1092217
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Kenichi Ishibashi <bashi@chromium.org>
Commit-Queue: Hitoshi Yoshida <peria@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#565588}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 37e2e88d9390b99f8271c05c59c10e26acfeb3f8
1 file changed