Revert of Eliminate silently letting errors pass on pak loading.

Revert of Eliminate silently letting errors pass on pak loading. (patchset #18 id:340001 of https://codereview.chromium.org/537063002/)

Reason for revert:
Cause issue https://code.google.com/p/chromium/issues/detail?id=424024, mostly confirmed on Mac Debug (Intel) bot, but could be responsible for windows bot issue too.  We'll see.

Original issue's description:
> Eliminate silently letting errors pass on pak loading.
> 
> BUG=410411
> TEST=no visible change
> 
> Committed: https://crrev.com/03c8c9d936594163d43222a3da0268b3dd9af656
> Cr-Commit-Position: refs/heads/master@{#299717}

TBR=bengr@chromium.org,caitkp@chromium.org,tfarina@chromium.org,tony@chromium.org,dcheng@chromium.org,avi@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=410411

[Zhenyao Mo, 2014-10-18 03:23:49]

Created Revert of Eliminate silently letting errors pass on pak loading.

[commit-bot: I haz the power, 2014-10-18 03:24:48]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/652623005/1

[commit-bot: I haz the power, 2014-10-18 03:25:23]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-10-18 03:25:24]

Failed to apply the patch.

[commit-bot: I haz the power, 2014-10-18 03:25:37]

The CQ bit was unchecked by commit-bot@chromium.org

[Zhenyao Mo, 2014-10-18 03:27:26]

The CQ bit was checked by zmo@chromium.org

[commit-bot: I haz the power, 2014-10-18 03:28:39]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/652623005/1

[commit-bot: I haz the power, 2014-10-18 03:29:19]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-10-18 03:29:20]

Failed to apply the patch.

[commit-bot: I haz the power, 2014-10-18 03:29:22]

The CQ bit was unchecked by commit-bot@chromium.org

[Avi (use Gerrit), 2014-10-18 05:07:40]

On 2014/10/18 03:29:20, I haz the power (commit-bot) wrote:
> Failed to apply the patch.

Dude! This was already reverted two days ago. Whatever problems you're having,
this patch wasn't it.

[Zhenyao Mo, 2014-10-18 15:27:18]

On 2014/10/18 05:07:40, Avi wrote:
> On 2014/10/18 03:29:20, I haz the power (commit-bot) wrote:
> > Failed to apply the patch.
> 
> Dude! This was already reverted two days ago. Whatever problems you're having,
> this patch wasn't it.

It definitely caused the bot to fail around that range.  If it's reverted two
days ago, then unfortunately another CL sneaked in and caused similar failure on
the same bot.  :(