Remove host_path_finder.py.

Remove host_path_finder.py.

This module seems unused. It was initially used in one function,
PurgeUnpinnedAshmem from android_commands.py which seems to be
gone. This cleanup is part of my quest to remove code that
contains "out/Debug" or "out/Release" explicitly.

BUG=

Committed: https://crrev.com/5be585002085bc2c95084d199c9cea58f66906ee
Cr-Commit-Position: refs/heads/master@{#345930}

[mikecase (-- gone --), 2015-08-27 17:05:00]

mikecase@chromium.org changed reviewers:
+ jbudorick@chromium.org

[jbudorick, 2015-08-27 17:09:49]

lgtm

[jbudorick, 2015-08-27 17:10:10]

On 2015/08/27 at 17:09:49, jbudorick wrote:
> lgtm

'tis a noble quest

[mikecase (-- gone --), 2015-08-27 17:12:11]

The CQ bit was checked by mikecase@chromium.org

[commit-bot: I haz the power, 2015-08-27 17:13:03]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1310283004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1310283004/1

[commit-bot: I haz the power, 2015-08-27 18:34:44]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-08-27 18:35:23]

Patchset 1 (id:??) landed as
https://crrev.com/5be585002085bc2c95084d199c9cea58f66906ee
Cr-Commit-Position: refs/heads/master@{#345930}