Revert of Add CHECKs to help debug crashes exposed by adding a member to IPC::Message::Header.

Revert of Add CHECKs to help debug crashes exposed by adding a member to IPC::Message::Header. (patchset #1 id:1 of https://codereview.chromium.org/1361903004/ )

Reason for revert:
Crashes have been exposed. This CL is no longer needed.

Original issue's description:
> Add CHECKs to help debug crashes exposed by adding a member to IPC::Message::Header.
>
> This CL checks that the data_offset field of the ResourceMsg_DataReceived has
> the appropriate range in both the sender and the receiver of the IPC message.
>
> BUG=527588
>
> Committed: https://crrev.com/01d2c16fa0ae1952af0d5519d134f944f898f70f
> Cr-Commit-Position: refs/heads/master@{#350421}

TBR=avi@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=527588
Committed: https://crrev.com/9c4295951b5e1587dd458de72f0abd86827b83ca
Cr-Commit-Position: refs/heads/master@{#350879}

[erikchen, 2015-09-25 19:07:04]

Created Revert of Add CHECKs to help debug crashes exposed by adding a member to
IPC::Message::Header.

[Avi (use Gerrit), 2015-09-25 19:09:10]

lgtm

[commit-bot: I haz the power, 2015-09-25 19:09:16]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1365963007/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1365963007/1

[commit-bot: I haz the power, 2015-09-25 19:11:24]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-09-25 19:12:41]

Patchset 1 (id:??) landed as
https://crrev.com/9c4295951b5e1587dd458de72f0abd86827b83ca
Cr-Commit-Position: refs/heads/master@{#350879}