Remove unused arguments in HTMLSelectElement class.

Remove unused arguments in HTMLSelectElement class.

- Remove |allowMultipleSelection| arguemnt of optionSelectedByUser().
  It's always false.

- Remove |shift| argument of listBoxSelectItem().
  It's always false.

Also, make optionSelectedByUser() private.

This CL has no behaivor changes.

Committed: https://crrev.com/08440aab1b983eba25cf27cce89e34ad49719bb4
Cr-Commit-Position: refs/heads/master@{#405107}

[tkent, 2016-07-13 07:44:38]

tkent@chromium.org changed reviewers:
+ keishi@chromium.org

[tkent, 2016-07-13 07:44:38]

Keishi, would you review this please?  It's very trivial.

[keishi, 2016-07-13 09:30:19]

LGTM

[tkent, 2016-07-13 09:35:25]

The CQ bit was checked by tkent@chromium.org

[commit-bot: I haz the power, 2016-07-13 09:35:39]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-07-13 09:39:38]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-07-13 09:41:15]

Description was changed from

==========
Remove unused arguments in HTMLSelectElement class.

- Remove |allowMultipleSelection| arguemnt of optionSelectedByUser().
  It's always false.

- Remove |shift| argument of listBoxSelectItem().
  It's always false.

Also, make optionSelectedByUser() private.

This CL has no behaivor changes.
==========

to

==========
Remove unused arguments in HTMLSelectElement class.

- Remove |allowMultipleSelection| arguemnt of optionSelectedByUser().
  It's always false.

- Remove |shift| argument of listBoxSelectItem().
  It's always false.

Also, make optionSelectedByUser() private.

This CL has no behaivor changes.

Committed: https://crrev.com/08440aab1b983eba25cf27cce89e34ad49719bb4
Cr-Commit-Position: refs/heads/master@{#405107}
==========

[commit-bot: I haz the power, 2016-07-13 09:41:16]

Patchset 1 (id:??) landed as
https://crrev.com/08440aab1b983eba25cf27cce89e34ad49719bb4
Cr-Commit-Position: refs/heads/master@{#405107}