Revert of Validate Bucket data in ShaderSourceBucket.

Revert of Validate Bucket data in ShaderSourceBucket. (patchset #6 id:100001 of https://codereview.chromium.org/822953002/)

Reason for revert:
No need to check for memory allocation failure.
New never returns NULL. In Chrome we
explicitly abort (crash) before returning
from the allocator in case of allocation failure.

Original issue's description:
> Validate Bucket data in ShaderSourceBucket.
>
> As of now only the received bucket and
> the size of bucket are validated. We
> should check for validation of bucket
> data before we start using it and report
> failures.
>
> BUG=240467
>
> Committed: https://crrev.com/6df438ed2adaf24fa2f4a92d4f3863825247b910
> Cr-Commit-Position: refs/heads/master@{#309882}

TBR=sievers@chromium.org,piman@chromium.org,bajones@chromium.org,zmo@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=240467
Committed: https://crrev.com/67d1a03057042dfc9bb0a71f9906320ee5204301
Cr-Commit-Position: refs/heads/master@{#310078}

[sivag, 2015-01-06 11:09:59]

Created Revert of Validate Bucket data in ShaderSourceBucket.

[commit-bot: I haz the power, 2015-01-06 11:11:02]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/802323005/1

[commit-bot: I haz the power, 2015-01-06 11:11:51]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-01-06 11:12:41]

Patchset 1 (id:??) landed as
https://crrev.com/67d1a03057042dfc9bb0a71f9906320ee5204301
Cr-Commit-Position: refs/heads/master@{#310078}