dbus: Rewrite ObjectProxy::CallMethodWithErrorCallback's comment

dbus: Rewrite ObjectProxy::CallMethodWithErrorCallback's comment

To make it clear which callback can get a nullptr when.

BUG=None

Committed: https://crrev.com/fd6b5515d45ca8559708fa1479dd762ad7c67225
Cr-Commit-Position: refs/heads/master@{#415890}

[hashimoto, 2016-09-01 02:30:24]

hashimoto@chromium.org changed reviewers:
+ derat@chromium.org

[hashimoto, 2016-09-01 02:30:24]

(cont. from https://codereview.chromium.org/2291453006/#msg24)
Please let me know any typos/grammatical errors/ambiguity/whatever you notice.
Thanks!

[Daniel Erat, 2016-09-01 04:19:29]

thanks, lgtm! and i see that the method that doesn't take an error callback
already documents when null is passed, and that looks good too.

[hashimoto, 2016-09-01 04:32:45]

The CQ bit was checked by hashimoto@chromium.org

[commit-bot: I haz the power, 2016-09-01 04:33:03]

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, 2016-09-01 05:19:00]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-09-01 05:20:41]

Description was changed from

==========
dbus: Rewrite ObjectProxy::CallMethodWithErrorCallback's comment

To make it clear which callback can get a nullptr when.

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

to

==========
dbus: Rewrite ObjectProxy::CallMethodWithErrorCallback's comment

To make it clear which callback can get a nullptr when.

BUG=None

Committed: https://crrev.com/fd6b5515d45ca8559708fa1479dd762ad7c67225
Cr-Commit-Position: refs/heads/master@{#415890}
==========

[commit-bot: I haz the power, 2016-09-01 05:20:42]

Patchset 1 (id:??) landed as
https://crrev.com/fd6b5515d45ca8559708fa1479dd762ad7c67225
Cr-Commit-Position: refs/heads/master@{#415890}