Add a comment about why HTMLObjectElement inherits FormAssociatedElement

Add a comment about why HTMLObjectElement inherits FormAssociatedElement

NOTRY=true

Committed: https://crrev.com/0024dfc8a1eeb0d179c6945d3b752e45416eb200
Cr-Commit-Position: refs/heads/master@{#404110}

[kochi, 2016-07-07 08:21:08]

Description was changed from

==========
Add a comment about why HTMLObjectElement inherits FormAssociatedElement
==========

to

==========
Add a comment about why HTMLObjectElement inherits FormAssociatedElement

NOTRY=true
==========

[kochi, 2016-07-07 08:21:08]

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

[kochi, 2016-07-07 08:25:07]

I spent a while why HTMLObjectElement inherits
FormAssociatedElement, and figured out that it was used
for NPAPI plugins but is not used any more.

Also I found the review comment from dcheng@ on NPAPI
form association removal CL:

https://codereview.chromium.org/1844383003#msg10
> the spec defines some of this behavior, so even though 
> it's a no-op, we'll probably have to leave it.

which is the reason we still keep it, and can't be removed
anytime soon without spec change.

I guess this is probably useful for someone who has the
same question as I.

[dcheng, 2016-07-07 09:12:36]

dcheng@chromium.org changed reviewers:
+ dcheng@chromium.org

[dcheng, 2016-07-07 09:12:36]

LGTM

Sorry I should have added this comment when I did the initial investigation.
Thanks!

[kochi, 2016-07-07 09:17:37]

The CQ bit was checked by kochi@chromium.org

[commit-bot: I haz the power, 2016-07-07 09:18:00]

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, 2016-07-07 09:21:54]

Description was changed from

==========
Add a comment about why HTMLObjectElement inherits FormAssociatedElement

NOTRY=true
==========

to

==========
Add a comment about why HTMLObjectElement inherits FormAssociatedElement

NOTRY=true
==========

[commit-bot: I haz the power, 2016-07-07 09:21:55]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-07-07 09:22:02]

CQ bit was unchecked.

[commit-bot: I haz the power, 2016-07-07 09:23:26]

Description was changed from

==========
Add a comment about why HTMLObjectElement inherits FormAssociatedElement

NOTRY=true
==========

to

==========
Add a comment about why HTMLObjectElement inherits FormAssociatedElement

NOTRY=true

Committed: https://crrev.com/0024dfc8a1eeb0d179c6945d3b752e45416eb200
Cr-Commit-Position: refs/heads/master@{#404110}
==========

[commit-bot: I haz the power, 2016-07-07 09:23:27]

Patchset 2 (id:??) landed as
https://crrev.com/0024dfc8a1eeb0d179c6945d3b752e45416eb200
Cr-Commit-Position: refs/heads/master@{#404110}