Pepper: Change uma presubmit to never block CQ.

Pepper: Change uma presubmit to never block CQ.

This changes the presubmit rule for adding pepper interface hashes to UMA to a
notification instead of a warning. This is because the presubmit is a bit too
broad, and was blocking some changes from being submitted through the CQ.

Using a notification message should be fine, since the impact of missing a
histogram is relatively low (we'll just see a number for a while), and the hash
can always be added later.

BUG=351389
R=xhwang@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=261411

[xhwang, 2014-04-02 16:53:07]

lgtm, thanks!

[teravest, 2014-04-02 16:54:20]

The CQ bit was checked by teravest@chromium.org

[commit-bot: I haz the power, 2014-04-02 16:55:18]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/teravest@chromium.org/221973003/1

[commit-bot: I haz the power, 2014-04-03 02:09:38]

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

[commit-bot: I haz the power, 2014-04-03 02:09:38]

Retried try job too often on android_aosp for step(s) compile
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=android_ao...

[teravest, 2014-04-03 14:18:57]

The CQ bit was checked by teravest@chromium.org

[commit-bot: I haz the power, 2014-04-03 14:19:24]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/teravest@chromium.org/221973003/1

[teravest, 2014-04-03 15:36:48]

Committed patchset #1 manually as r261411 (presubmit successful).