ChannelMojo: Turn DLOG to LOG for ERROR and WARNING

ChannelMojo: Turn DLOG to LOG for ERROR and WARNING

It'd be useful to diagnose IPC related issues, especially
Chrome OS builds where Release build is the norm.
This shouldn't be noisy as these won't happen in normal use.

R=viettrungluu@chromium.org
TEST=466814
BUG=

Committed: https://crrev.com/a3889aa737db9a6e94b24c5f5f0dc33154bfa2c6
Cr-Commit-Position: refs/heads/master@{#320810}

[viettrungluu, 2015-03-16 20:29:56]

lgtm

[Hajime Morrita, 2015-03-16 20:38:46]

The CQ bit was checked by morrita@chromium.org

[commit-bot: I haz the power, 2015-03-16 20:39:33]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1003483004/1

[commit-bot: I haz the power, 2015-03-16 22:41:00]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-03-16 22:42:16]

Patchset 1 (id:??) landed as
https://crrev.com/a3889aa737db9a6e94b24c5f5f0dc33154bfa2c6
Cr-Commit-Position: refs/heads/master@{#320810}