Replace CursorList with RefVector<CursorData>.

Replace CursorList with RefVector<CursorData>.

We recently added a template in wtf/ for any case where we want to
store a Vector in a RefPtr. The list of CursorData objects should be
implemented by re-using that template, rather than with its own special
class which does exactly the same thing.

I added RefVector::at, because it's used by existing CursorList-code.
(See CSSComputedStyleDeclaration:1875).

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=174367

[esprehn, 2014-05-19 22:07:42]

lgtm

[commit-bot: I haz the power, 2014-05-19 22:08:01]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/andersr@opera.com/291863003/1

[commit-bot: I haz the power, 2014-05-19 23:35:06]

FYI, CQ is re-trying this CL (attempt #1).
Please consider checking whether the failures are real,
and report flakes to chrome-troopers@google.com.
The failing builders are:
  blink_presubmit on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/blink_presubmit/builds/5704)
  linux_blink_dbg on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/linux_blink_dbg/builds/8904)
  linux_blink_rel on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/linux_blink_rel/builds/8726)
  mac_blink_rel on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/mac_blink_rel/builds/8194)
  win_blink_rel on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/win_blink_rel/builds/8288)

[commit-bot: I haz the power, 2014-05-19 23:47:59]

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

[commit-bot: I haz the power, 2014-05-19 23:48:00]

Try jobs failed on following builders:
  blink_presubmit on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/blink_presubmit/builds/5709)

[Julien - ping for review, 2014-05-20 11:14:11]

lgtm

[commit-bot: I haz the power, 2014-05-20 11:31:08]

Change committed as 174367