Revert of MSan: check data is initialized when serializing with base::Pickle.

Revert of MSan: check data is initialized when serializing with base::Pickle. (patchset #1 id:1 of https://codereview.chromium.org/988693004/)

Reason for revert:
Found errors w.r.t. IPC messages. Reverting for now while people fix the errors.

Original issue's description:
> MSan: check data is initialized when serializing with base::Pickle.
>
> Serialization implies that the data is going to leave the process one way or
> another, and it's never a good idea to leak uninitialized bytes. In most cases
> MSan would catch this later on (e.g. on a write()). There are exceptions to
> that, however, such as writing to shared memory. It doesn't hurt to have an
> extra check here.
>
> BUG=463906
> R=thakis@chromium.org
>
> Committed: https://crrev.com/2c705b038413d30d7aae5ff5d09882575e93c898
> Cr-Commit-Position: refs/heads/master@{#319459}

TBR=thakis@chromium.org,earthdok@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=463906
Committed: https://crrev.com/d74906086c38b72bed2017a772c67f3c3fde2709
Cr-Commit-Position: refs/heads/master@{#319510}

[Lei Zhang, 2015-03-06 21:34:01]

Created Revert of MSan: check data is initialized when serializing with
base::Pickle.

[commit-bot: I haz the power, 2015-03-06 21:35:15]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/985893002/1

[commit-bot: I haz the power, 2015-03-06 21:36:17]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-03-06 21:37:12]

Patchset 1 (id:??) landed as
https://crrev.com/d74906086c38b72bed2017a772c67f3c3fde2709
Cr-Commit-Position: refs/heads/master@{#319510}

[Nico, 2015-03-06 21:38:05]

do you have a list of bugs?

[Lei Zhang, 2015-03-06 21:38:36]

On 2015/03/06 21:38:05, Nico wrote:
> do you have a list of bugs?

I'll file them shortly.

[Lei Zhang, 2015-03-06 21:48:34]

On 2015/03/06 21:38:36, Lei Zhang wrote:
> On 2015/03/06 21:38:05, Nico wrote:
> > do you have a list of bugs?
> 
> I'll file them shortly.

https://code.google.com/p/chromium/issues/detail?id=464836
https://code.google.com/p/chromium/issues/detail?id=464837
https://code.google.com/p/chromium/issues/detail?id=464843

[Lei Zhang, 2015-03-07 04:16:52]

On 2015/03/06 21:48:34, Lei Zhang wrote:
> On 2015/03/06 21:38:36, Lei Zhang wrote:
> > On 2015/03/06 21:38:05, Nico wrote:
> > > do you have a list of bugs?
> > 
> > I'll file them shortly.
> 
> https://code.google.com/p/chromium/issues/detail?id=464836
> https://code.google.com/p/chromium/issues/detail?id=464837
> https://code.google.com/p/chromium/issues/detail?id=464843

I looked at all three today. The first two are very easy to fix. The 3rd bug may
require a bit more examination, but I laid out the possibly issues in the bug.
So hopefully we'll be able to revert with revert next week.

[earthdok, 2015-03-10 14:37:09]

On 2015/03/07 04:16:52, Lei Zhang wrote:
> On 2015/03/06 21:48:34, Lei Zhang wrote:
> > On 2015/03/06 21:38:36, Lei Zhang wrote:
> > > On 2015/03/06 21:38:05, Nico wrote:
> > > > do you have a list of bugs?
> > > 
> > > I'll file them shortly.
> > 
> > https://code.google.com/p/chromium/issues/detail?id=464836
> > https://code.google.com/p/chromium/issues/detail?id=464837
> > https://code.google.com/p/chromium/issues/detail?id=464843
> 
> I looked at all three today. The first two are very easy to fix. The 3rd bug
may
> require a bit more examination, but I laid out the possibly issues in the bug.
> So hopefully we'll be able to revert with revert next week.

Thanks for handling this!

[Lei Zhang, 2015-03-16 22:35:43]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/1008393004/ by thestig@chromium.org.

The reason for reverting is: The bugs that caused the revert have been fixed -
Unreverting..