Add const versions of some toHTMLFooElement().

Add const versions of some toHTMLFooElement().

We'd like to avoid bare static_cast<const Foo*> too.

BUG=none
TEST=none; no behavior change.

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=157440

[esprehn, 2013-09-09 06:24:49]

LGTM, we really need to switch to auto generating all these methods like they do
in Webkit.

[tkent, 2013-09-09 06:27:25]

On 2013/09/09 06:24:49, esprehn wrote:
> LGTM, we really need to switch to auto generating all these methods like they
do
> in Webkit.

Thanks.
It's already in review :) https://codereview.chromium.org/23991004/

[commit-bot: I haz the power, 2013-09-09 06:27:47]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/tkent@chromium.org/23680013/1

[commit-bot: I haz the power, 2013-09-09 06:34:11]

Change committed as 157440