roll_webrtc.py: Improve no-op roll message.

roll_webrtc.py: Improve no-op roll message.

Currently there's no information printed when the
execution of the roll script is a no-op (e.g. when
the latest revision is already rolled).

BUG=

Committed: https://crrev.com/fb7186b3d00c9c733f99fa3467096cf4e86459e2
Cr-Commit-Position: refs/heads/master@{#333722}

[kjellander_chromium, 2015-06-10 11:25:28]

kjellander@chromium.org changed reviewers:
+ henrika@chromium.org

[henrika_webrtc, 2015-06-10 11:36:51]

LGTM

[kjellander_chromium, 2015-06-10 11:41:24]

The CQ bit was checked by kjellander@chromium.org

[commit-bot: I haz the power, 2015-06-10 11:41:33]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1172323002/1

[commit-bot: I haz the power, 2015-06-10 11:41:35]

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

[commit-bot: I haz the power, 2015-06-10 11:41:36]

No LGTM from a valid reviewer yet. Only full committers are accepted.
Even if an LGTM may have been provided, it was from a non-committer,
_not_ a full super star committer.
See http://www.chromium.org/getting-involved/become-a-committer
Note that this has nothing to do with OWNERS files.

[henrika (OOO until Aug 14), 2015-06-10 11:49:51]

LGTM

[kjellander_chromium, 2015-06-10 11:50:28]

The CQ bit was checked by kjellander@chromium.org

[commit-bot: I haz the power, 2015-06-10 11:50:32]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1172323002/1

[commit-bot: I haz the power, 2015-06-10 11:58:34]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-06-10 11:59:25]

Patchset 1 (id:??) landed as
https://crrev.com/fb7186b3d00c9c733f99fa3467096cf4e86459e2
Cr-Commit-Position: refs/heads/master@{#333722}