Make mojo::internal::Buffer a non-virtual class.

Make mojo::internal::Buffer a non-virtual class.

BUG=None

Committed: https://crrev.com/b01ff92c43d91c0d0a61c8b35645e23535aa92a4
Cr-Commit-Position: refs/heads/master@{#409706}

[yzshen1, 2016-08-03 18:10:36]

The CQ bit was checked by yzshen@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-08-03 18:11:29]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[yzshen1, 2016-08-03 18:12:18]

yzshen@chromium.org changed reviewers:
+ rockot@chromium.org

[yzshen1, 2016-08-03 18:12:19]

Hi, Ken.

Please take a look.

It turns out that this change doesn't affect performance much. But it simplifies
the code so I still feel like to land it. WDYT? Thanks!

[commit-bot: I haz the power, 2016-08-03 19:59:33]

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

[commit-bot: I haz the power, 2016-08-03 19:59:34]

Dry run: Try jobs failed on following builders:
  linux_android_rel_ng on master.tryserver.chromium.android (JOB_FAILED,
https://build.chromium.org/p/tryserver.chromium.android/builders/linux_androi...)

[Ken Rockot(use gerrit already), 2016-08-04 00:10:09]

lgtm

[yzshen1, 2016-08-04 01:57:11]

The CQ bit was checked by yzshen@chromium.org

[commit-bot: I haz the power, 2016-08-04 01:57:38]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-08-04 02:32:50]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-08-04 02:34:04]

Description was changed from

==========
Make mojo::internal::Buffer a non-virtual class.

BUG=None
==========

to

==========
Make mojo::internal::Buffer a non-virtual class.

BUG=None

Committed: https://crrev.com/b01ff92c43d91c0d0a61c8b35645e23535aa92a4
Cr-Commit-Position: refs/heads/master@{#409706}
==========

[commit-bot: I haz the power, 2016-08-04 02:34:05]

Patchset 1 (id:??) landed as
https://crrev.com/b01ff92c43d91c0d0a61c8b35645e23535aa92a4
Cr-Commit-Position: refs/heads/master@{#409706}