Remove histograms for system IPCs returning NPEs.

Remove histograms for system IPCs returning NPEs.

The histograms aren't serving an important purpose anymore.
Leave in code to retry as this does help sometimes.
Catch the NPE to avoid crashing.

BUG=592131
R=xunjieli@chromium.org

Review-Url: https://codereview.chromium.org/2872353003
Cr-Commit-Position: refs/heads/master@{#471547}
Committed: https://chromium.googlesource.com/chromium/src/+/1c8889efcad513d89995f0c6eb2a3d6a0f3d4216

[pauljensen, 2017-05-11 15:07:54]

Helen, PTAL, thank you!

[xunjieli, 2017-05-11 15:14:16]

On 2017/05/11 15:07:54, pauljensen wrote:
> Helen, PTAL, thank you!

lgtm. Could you mark these two histograms as deprecated in histograms.xml too ?

[pauljensen, 2017-05-11 15:56:10]

pauljensen@chromium.org changed reviewers:
+ holte@chromium.org

[pauljensen, 2017-05-11 15:56:10]

Steven, PTAL @ histograms.xml, thank you!

[pauljensen, 2017-05-12 11:46:56]

Friendly ping Steven; this is a nice simple review, just marking some histograms
deprecated.

[Steven Holte, 2017-05-13 00:15:24]

On 2017/05/12 11:46:56, pauljensen wrote:
> Friendly ping Steven; this is a nice simple review, just marking some
histograms
> deprecated.

lgtm

[pauljensen, 2017-05-13 00:46:50]

The CQ bit was checked by pauljensen@chromium.org

[pauljensen, 2017-05-13 00:46:50]

The patchset sent to the CQ was uploaded after l-g-t-m from
xunjieli@chromium.org
Link to the patchset: https://codereview.chromium.org/2872353003/#ps40001
(title: "sync")

[commit-bot: I haz the power, 2017-05-13 00:47:27]

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, 2017-05-13 03:29:02]

CQ is committing da patch.

Bot data: {"patchset_id": 40001, "attempt_start_ts": 1494636410502700,
"parent_rev": "555816aee7d8e289419a9223934b87ea5a4ecb1a", "commit_rev":
"1c8889efcad513d89995f0c6eb2a3d6a0f3d4216"}

[commit-bot: I haz the power, 2017-05-13 03:29:19]

Description was changed from

==========
Remove histograms for system IPCs returning NPEs.

The histograms aren't serving an important purpose anymore.
Leave in code to retry as this does help sometimes.
Catch the NPE to avoid crashing.

BUG=592131
R=xunjieli@chromium.org
==========

to

==========
Remove histograms for system IPCs returning NPEs.

The histograms aren't serving an important purpose anymore.
Leave in code to retry as this does help sometimes.
Catch the NPE to avoid crashing.

BUG=592131
R=xunjieli@chromium.org

Review-Url: https://codereview.chromium.org/2872353003
Cr-Commit-Position: refs/heads/master@{#471547}
Committed:
https://chromium.googlesource.com/chromium/src/+/1c8889efcad513d89995f0c6eb2a...
==========

[commit-bot: I haz the power, 2017-05-13 03:29:20]

Committed patchset #3 (id:40001) as
https://chromium.googlesource.com/chromium/src/+/1c8889efcad513d89995f0c6eb2a...