Switch TextCheckingParagraph&Helper over to EphemeralRanges.

Switch TextCheckingParagraph&Helper over to EphemeralRanges.

With the lighter EphemeralRange available, it is unnecessary to have
the SpellChecker utilities TextCheckingHelper and TextCheckingParagraph
continue to use Range objects. Switch over to EphemeralRange.

R=yosin
BUG=388681
Committed: https://crrev.com/9bc725c0c136c2749ba5caff77fa649908c10f5e
git-svn-id: svn://svn.chromium.org/blink/trunk@202121 bbb929c8-8fbe-4397-9dbb-9b2b20218538

[sof, 2015-09-10 12:45:31]

sigbjornf@opera.com changed reviewers:
+ yosin@chromium.org

[sof, 2015-09-10 12:45:32]

please take a look.

[yosin_UTC9, 2015-09-11 00:59:29]

lgtm

This is so great change!
This makes my life easier with working on spell checker.
:*.;".*･;･^;･:\(o^▽^o)/:･;^･;･*."

[yosin_UTC9, 2015-09-11 00:59:33]

The CQ bit was checked by yosin@chromium.org

[commit-bot: I haz the power, 2015-09-11 00:59:50]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1331893002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1331893002/1

[commit-bot: I haz the power, 2015-09-11 01:02:02]

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

[commit-bot: I haz the power, 2015-09-11 01:02:02]

Try jobs failed on following builders:
  mac_chromium_rel_ng on tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/mac_chromium_rel_...)

[sof, 2015-09-11 05:51:41]

The CQ bit was checked by sigbjornf@opera.com

[commit-bot: I haz the power, 2015-09-11 05:51:52]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1331893002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1331893002/1

[commit-bot: I haz the power, 2015-09-11 05:53:51]

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

[commit-bot: I haz the power, 2015-09-11 05:53:51]

Try jobs failed on following builders:
  mac_chromium_rel_ng on tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/mac_chromium_rel_...)

[sof, 2015-09-11 05:56:54]

The CQ bit was checked by sigbjornf@opera.com

[sof, 2015-09-11 05:56:55]

The patchset sent to the CQ was uploaded after l-g-t-m from yosin@chromium.org
Link to the patchset: https://codereview.chromium.org/1331893002/#ps20001
(title: "rebased")

[commit-bot: I haz the power, 2015-09-11 05:57:06]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1331893002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1331893002/20001

[commit-bot: I haz the power, 2015-09-11 08:07:08]

Committed patchset #2 (id:20001) as
https://src.chromium.org/viewvc/blink?view=rev&revision=202121

[commit-bot: I haz the power, 2015-09-23 12:20:27]

Patchset 2 (id:??) landed as
https://crrev.com/9bc725c0c136c2749ba5caff77fa649908c10f5e