Revert of Re-enable ChannelMojo

Revert of Re-enable ChannelMojo (patchset #1 id:1 of https://codereview.chromium.org/1021393002/)

Reason for revert:
speculative revert for "Too many open files" on various Mac bots.
e.g. http://build.chromium.org/p/chromium.webkit/builders/WebKit%20Mac10.9/builds/17511/steps/webkit_tests/logs/stdio

Original issue's description:
> Re-enable ChannelMojo
>
> It was disabled due to crbug.com/466814 that is now fixed.
> It's time to turn it on again.
>
> R=viettrungluu@chromium.org
> BUG=466814, 377980
>
> Committed: https://crrev.com/c99c93842fa50f85888d069f0be962462f92a643
> Cr-Commit-Position: refs/heads/master@{#322092}

TBR=viettrungluu@chromium.org,morrita@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=466814, 377980
Committed: https://crrev.com/9e4596122cda5dbc959895b53679e14df45658b5
Cr-Commit-Position: refs/heads/master@{#322113}

[tkent, 2015-03-25 04:39:18]

Created Revert of Re-enable ChannelMojo

[commit-bot: I haz the power, 2015-03-25 04:40:28]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1029263008/1

[commit-bot: I haz the power, 2015-03-25 04:41:31]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-03-25 04:42:06]

Patchset 1 (id:??) landed as
https://crrev.com/9e4596122cda5dbc959895b53679e14df45658b5
Cr-Commit-Position: refs/heads/master@{#322113}

[tkent, 2015-03-25 05:58:53]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/1031083002/ by tkent@chromium.org.

The reason for reverting is: It seems it was not guilty.
According to Android Tests (dbg) bot, revering #322094 was enough.
.