Sync CharacterData and related interfaces with the spec

Sync CharacterData and related interfaces with the spec

https://dom.spec.whatwg.org/#interface-characterdata
https://dom.spec.whatwg.org/#interface-comment
https://dom.spec.whatwg.org/#interface-processinginstruction
https://dom.spec.whatwg.org/#interface-text

This replaces |length| with |count| in a few places. The implementation
already uses |count| as the argument name.

BUG=460722
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=190625

[philipj_slow, 2015-02-21 19:55:42]

of

[philipj_slow, 2015-02-22 03:39:16]

philipj@opera.com changed reviewers:
+ haraken@chromium.org

[philipj_slow, 2015-02-22 03:39:17]

haraken@, you're in a good timezone for me now, but please let me know of you're
not interested in reviewing lots of these CLs, out of there's anyone else in
Tokyo who might be interested.

[haraken, 2015-02-22 08:01:20]

LGTM

> haraken@, you're in a good timezone for me now, but please let me know of
you're
> not interested in reviewing lots of these CLs, out of there's anyone else in
> Tokyo who might be interested.

Nope, thanks for the great work!

[philipj_slow, 2015-02-22 09:34:21]

The CQ bit was checked by philipj@opera.com

[commit-bot: I haz the power, 2015-02-22 09:35:11]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/946823002/20001

[commit-bot: I haz the power, 2015-02-22 10:57:34]

Committed patchset #2 (id:20001) as
https://src.chromium.org/viewvc/blink?view=rev&revision=190625