Revert of Enable loading V8's initial snapshot from external files on Linux.

Revert of Enable loading V8's initial snapshot from external files on Linux. (patchset #2 id:20001 of https://codereview.chromium.org/735043002/)

Also partial revert of cl r304601 (https://codereview.chromium.org/734163007/) to remove snapshot files form Files.cfg.

Reason for revert:
Breaking PrintPreviewWebUITest on linux bots.

BUG=435167, 421063, 434985
Original issue's description:
> Enable loading V8's initial snapshot from external files on Linux.
>
> BUG=421063, 434985
>
> Committed: https://crrev.com/85e17b910590a0da3ed71b5f44e55cba79ea990d
> Cr-Commit-Position: refs/heads/master@{#305007}

TBR=baixo@google.com,baixo@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=421063, 434985
Committed: https://crrev.com/69aa92c0b97d845cfe0daf21879055cc354be379
Cr-Commit-Position: refs/heads/master@{#305023}

[rmcilroy, 2014-11-20 16:40:26]

Created Revert of Enable loading V8's initial snapshot from external files on
Linux.

[rmcilroy, 2014-11-20 16:46:30]

The CQ bit was checked by rmcilroy@chromium.org

[commit-bot: I haz the power, 2014-11-20 16:47:16]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/740403002/40001

[commit-bot: I haz the power, 2014-11-20 16:48:11]

Committed patchset #2 (id:40001)

[commit-bot: I haz the power, 2014-11-20 16:48:51]

Patchset 2 (id:??) landed as
https://crrev.com/69aa92c0b97d845cfe0daf21879055cc354be379
Cr-Commit-Position: refs/heads/master@{#305023}