Rename ObjectAliveTrait::isAlive() to isHeapObjectAlive().

Rename ObjectAliveTrait::isAlive() to isHeapObjectAlive().

This method is only invoked by Visitor::isAlive() and never explicitly
declared in "user code", so switch to a name less likely to conflict
with what an object might otherwise provide.

R=haraken
BUG=420515
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=183282

[haraken, 2014-10-06 08:48:37]

haraken@chromium.org changed reviewers:
+ haraken@chromium.org, oilpan-reviews@chromium.org

[haraken, 2014-10-06 08:48:38]

LGTM

[sof, 2014-10-06 11:56:45]

The CQ bit was checked by sigbjornf@opera.com

[commit-bot: I haz the power, 2014-10-06 11:57:22]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/633463002/1

[commit-bot: I haz the power, 2014-10-06 15:12:07]

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

[commit-bot: I haz the power, 2014-10-06 15:12:08]

Try jobs failed on following builders:
  win_blink_rel on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/win_blink_rel/builds/30334)

[sof, 2014-10-06 17:15:11]

The CQ bit was checked by sigbjornf@opera.com

[commit-bot: I haz the power, 2014-10-06 17:15:59]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/633463002/1

[commit-bot: I haz the power, 2014-10-06 18:16:18]

Committed patchset #1 (id:1) as 183282