Prevent read-after-buffer in SourcePositionTableIterator::Advance.

Prevent read-after-buffer in SourcePositionTableIterator::Advance.

R=yangguo@chromium.org
BUG=chromium:667142
Committed: https://crrev.com/da72a3176fba32b39049d070fbd2d789bbbfe8b6
Cr-Commit-Position: refs/heads/master@{#41224}

[vogelheim, 2016-11-23 13:19:18]

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

[commit-bot: I haz the power, 2016-11-23 13:19:28]

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

[vogelheim, 2016-11-23 13:40:26]

ptal

(A bit more info is in the bug.)

[Yang, 2016-11-23 13:41:56]

On 2016/11/23 13:40:26, vogelheim wrote:
> ptal
> 
> (A bit more info is in the bug.)

lgtm

[commit-bot: I haz the power, 2016-11-23 13:46:07]

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

[commit-bot: I haz the power, 2016-11-23 13:46:07]

Dry run: This issue passed the CQ dry run.

[vogelheim, 2016-11-23 13:46:32]

The CQ bit was checked by vogelheim@chromium.org

[commit-bot: I haz the power, 2016-11-23 13:46:37]

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, 2016-11-23 13:48:32]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1479908792163040, "parent_rev":
"6b93e767706ae3e27fa6a43fda1667126fe8b8d1", "commit_rev":
"e686cdbb98534ca972e76949329fc1321aaa1b1f"}

[commit-bot: I haz the power, 2016-11-23 13:48:36]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-11-23 13:48:53]

Description was changed from

==========
Prevent read-after-buffer in SourcePositionTableIterator::Advance.

R=yangguo@chromium.org
BUG=chromium:667142
==========

to

==========
Prevent read-after-buffer in SourcePositionTableIterator::Advance.

R=yangguo@chromium.org
BUG=chromium:667142

Committed: https://crrev.com/da72a3176fba32b39049d070fbd2d789bbbfe8b6
Cr-Commit-Position: refs/heads/master@{#41224}
==========

[commit-bot: I haz the power, 2016-11-23 13:48:54]

Patchset 1 (id:??) landed as
https://crrev.com/da72a3176fba32b39049d070fbd2d789bbbfe8b6
Cr-Commit-Position: refs/heads/master@{#41224}