Remove usages of temporary Range objects that end up registered on the

Remove usages of temporary Range objects that end up registered on the
Document for no reason.

This is important for Oilpan because the Ranges do not die until the
next GC. This gives a 10% improvement on DOM/textarea-edit in the
oilpan build.

R=yosin@chromium.org
BUG=388681
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=181889

[yosin_UTC9, 2014-09-12 01:07:21]

LGTM

yoicho@, just FYI, removing document markers, by spell checker, also causes
layout update via TextIterator.

I think in DMC::removeMarkers() should iterator over existing marker and check
marker in range, e.g.

removeMarker(start, end)
for (marker in markers) {
  if (marker >= start && marker < end)
    removeMarker(marker);
}

[Mads Ager (chromium), 2014-09-12 09:20:14]

The CQ bit was checked by ager@chromium.org

[commit-bot: I haz the power, 2014-09-12 09:21:05]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patchset/565613002/1

[commit-bot: I haz the power, 2014-09-12 10:24:38]

Committed patchset #1 (id:1) as 181889