Remove unused/unneeded code from core/editing.

Remove unused/unneeded code from core/editing.

Remove few unused method and CaretBase::m_caretRectNeedsUpdate member,
because it is not checked, but adjusted.

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=188777

[bzsolt, 2014-12-16 17:27:59]

zsborbely.u-szeged@partner.samsung.com changed reviewers:
+ yutak@chromium.org

[Yuta Kitamura, 2015-01-08 06:52:06]

yutak@chromium.org changed reviewers:
+ yosin@chromium.org

[Yuta Kitamura, 2015-01-08 06:52:06]

lgtm, adding yosin to be sure

[yosin_UTC9, 2015-01-14 01:39:23]

yosin@chromium.org changed reviewers:
+ yoichio@chromium.org

[yosin_UTC9, 2015-01-14 01:39:24]

lgtm. Thanks for cleanup!

+yoichio who made unused variables and functions in |Caret| class for
"Caret.{cc,h}" review.

[yoichio, 2015-01-14 02:11:43]

lgtm

[bzsolt, 2015-01-14 10:14:46]

Thanks for the reviews!

[bzsolt, 2015-01-14 10:14:52]

The CQ bit was checked by zsborbely.u-szeged@partner.samsung.com

[commit-bot: I haz the power, 2015-01-14 10:15:15]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/806223002/1

[commit-bot: I haz the power, 2015-01-14 12:23:32]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-01-14 12:23:33]

Try jobs failed on following builders:
  linux_blink_dbg on tryserver.blink ()

[bzsolt, 2015-01-21 21:50:04]

The CQ bit was checked by zsborbely.u-szeged@partner.samsung.com

[commit-bot: I haz the power, 2015-01-21 21:50:43]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/806223002/1

[commit-bot: I haz the power, 2015-01-21 23:03:42]

Committed patchset #1 (id:1) as
https://src.chromium.org/viewvc/blink?view=rev&revision=188777