Remove unused GCObject class.

Remove unused GCObject class.

This dummy class was accidentally re-introduced in PersistentNode.cpp during the
r389469 revert; remove it.

R=
BUG=

Committed: https://crrev.com/ca90ea2310c17735b8df076606cb845c3b0dc8f6
Cr-Commit-Position: refs/heads/master@{#390323}

[sof, 2016-04-28 06:35:26]

sigbjornf@opera.com changed reviewers:
+ oilpan-reviews@chromium.org

[sof, 2016-04-28 06:35:26]

please take a look.

[haraken, 2016-04-28 06:36:26]

LGTM

[sof, 2016-04-28 06:37:01]

The CQ bit was checked by sigbjornf@opera.com

[commit-bot: I haz the power, 2016-04-28 06:37:10]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1925973002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1925973002/1

[commit-bot: I haz the power, 2016-04-28 07:50:00]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-04-30 17:16:53]

Patchset 1 (id:??) landed as
https://crrev.com/ca90ea2310c17735b8df076606cb845c3b0dc8f6
Cr-Commit-Position: refs/heads/master@{#390323}

[commit-bot: I haz the power, 2016-04-30 17:54:36]

Description was changed from

==========
Remove unused GCObject class.

This dummy class was accidentally re-introduced in PersistentNode.cpp during the
r389469 revert; remove it.

R=
BUG=
==========

to

==========
Remove unused GCObject class.

This dummy class was accidentally re-introduced in PersistentNode.cpp during the
r389469 revert; remove it.

R=
BUG=

Committed: https://crrev.com/ca90ea2310c17735b8df076606cb845c3b0dc8f6
Cr-Commit-Position: refs/heads/master@{#390323}
==========