Revert of IPC::ChannelMojo: Make IPC handling robust against bad messages.

Revert of IPC::ChannelMojo: Make IPC handling robust against bad messages. (patchset #3 id:40001 of https://codereview.chromium.org/725733002/)

Reason for revert:
Broke ipc fuzzer

Original issue's description:
> IPC::ChannelMojo: Make IPC handling robust against bad messages.
>
> This change replaces some DCHECK()s with real error handling.
> They happen when it receives broken messages.
>
> BUG=428800
> R=viettrungluu@chromium.org
>
> Committed: https://crrev.com/185ffdf58f85e47db9666d2ad9b80ff9bd7fa54b
> Cr-Commit-Position: refs/heads/master@{#304102}

TBR=viettrungluu@chromium.org,morrita@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=428800
Committed: https://crrev.com/726621f93d2802dfc2c90732c7133145c9854e38
Cr-Commit-Position: refs/heads/master@{#313778}

[inferno, 2015-01-29 20:34:48]

Created Revert of IPC::ChannelMojo: Make IPC handling robust against bad
messages.

[commit-bot: I haz the power, 2015-01-29 20:35:55]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/883373002/1

[commit-bot: I haz the power, 2015-01-29 20:37:39]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-01-29 20:39:41]

Patchset 1 (id:??) landed as
https://crrev.com/726621f93d2802dfc2c90732c7133145c9854e38
Cr-Commit-Position: refs/heads/master@{#313778}

[inferno, 2015-01-29 20:39:51]

inferno@chromium.org changed reviewers:
+ tsepez@chromium.org

[inferno, 2015-01-29 20:43:25]

On 2015/01/29 20:39:41, I haz the power (commit-bot) wrote:
> Patchset 1 (id:??) landed as
> https://crrev.com/726621f93d2802dfc2c90732c7133145c9854e38
> Cr-Commit-Position: refs/heads/master@{#313778}

Wrong revert, reverting the revert. Sorry i should have checked the dates
properly. IPC fuzzer broke, we suspected this as the cause.

[inferno, 2015-01-29 20:43:51]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/892503002/ by inferno@chromium.org.

The reason for reverting is: Wrong revert, ipc fuzzer broke because of something
else..