Revert of Allow RunShellCommand to work even with very large commands

Revert of Allow RunShellCommand to work even with very large commands (patchset #6 id:100001 of https://codereview.chromium.org/751063002/)

Reason for revert:
Broke provision_devices on android perf bots

Original issue's description:
> Allow RunShellCommand to work even with very large commands
>
> Currently RunShellCommand may not work if the command passed to
> adb.Shell is too large (e.g. > 1024). This CL addresses this
> issue, allowing to run even very large commands, by first writing
> the command as a shell script and then running it.
>
> BUG=436133
>
> Committed: https://crrev.com/b35110e91edb38ec81c84e188b35012492bbcc28
> Cr-Commit-Position: refs/heads/master@{#307223}

TBR=jbudorick@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=436133, 439953
Committed: https://crrev.com/18c51ee4a72446a5af09b896c5d1b465882c3335
Cr-Commit-Position: refs/heads/master@{#307263}

[perezju, 2014-12-08 16:58:05]

Created Revert of Allow RunShellCommand to work even with very large commands

[perezju, 2014-12-08 16:58:20]

The CQ bit was unchecked by perezju@chromium.org

[jbudorick, 2014-12-08 16:58:23]

lgtm

[perezju, 2014-12-08 16:58:54]

The CQ bit was checked by perezju@chromium.org

[commit-bot: I haz the power, 2014-12-08 16:59:46]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/773043005/1

[commit-bot: I haz the power, 2014-12-08 17:00:46]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-12-08 17:01:31]

Patchset 1 (id:??) landed as
https://crrev.com/18c51ee4a72446a5af09b896c5d1b465882c3335
Cr-Commit-Position: refs/heads/master@{#307263}