Revert of Revert of Enable ChannelMojo

Revert of Revert of Enable ChannelMojo (patchset #1 id:1 of https://codereview.chromium.org/875333002/)

Reason for revert:
This revert was innocent. The culprit was
https://codereview.chromium.org/878843002/

Original issue's description:
> Revert of Enable ChannelMojo (patchset #3 id:40001 of https://codereview.chromium.org/857483004/)
>
> Reason for revert:
> many ipc test failed.
> https://build.chromium.org/p/chromium.memory/builders/Linux%20ASan%20LSan%20Tests%20%281%29/builds/10036
>
> Original issue's description:
> > Enable ChannelMojo
> >
> > As we addressed certain amount of the performance problem,
> > it's time to give it another try.
> >
> > R=viettrungluu@chromium.org
> > BUG=377980
> >
> > Committed: https://crrev.com/a06cd1b2fe83b51b0874ca504066f00a17192026
> > Cr-Commit-Position: refs/heads/master@{#313184}
>
> TBR=viettrungluu@chromium.org,morrita@chromium.org
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=377980
>
> Committed: https://crrev.com/af01416ada7b968c55224be9e61272ad73e59fe1
> Cr-Commit-Position: refs/heads/master@{#313225}

TBR=viettrungluu@chromium.org,yoichio@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=377980
Committed: https://crrev.com/599be60af8d7643966e26fe631768e4a5c99e991
Cr-Commit-Position: refs/heads/master@{#313318}

[Hajime Morrita, 2015-01-27 18:55:11]

Created Revert of Revert of Enable ChannelMojo

[commit-bot: I haz the power, 2015-01-27 18:55:56]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/881863002/1

[commit-bot: I haz the power, 2015-01-27 18:57:15]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-01-27 18:59:36]

Patchset 1 (id:??) landed as
https://crrev.com/599be60af8d7643966e26fe631768e4a5c99e991
Cr-Commit-Position: refs/heads/master@{#313318}