Revert of Added orphaned compiled Python file checks. (patchset #2 id:20001 of https://codereview.chromium.org/621533002/)

Reason for revert:
Makes `git cl upload` very slow in chrome checkouts.

Original issue's description:
> Added orphaned compiled Python file checks.
> 
> There have been a handful of cases where orphaned compiled Python files (.pyc
> files without an accompanying .py file) have been loaded preferentially by
> the presubmit scripts, causing weird problems. This adds a check and a mode for
> such files, either warning the user or deleting them.
> 
> BUG=None
> TEST=local
>   - Tested against local repository.
> 
> R=iannucci@chromium.org, szager@chromium.org
> 
> Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=292703

TBR=iannucci@chromium.org,szager@chromium.org,dnj@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=None

Review URL: https://codereview.chromium.org/701683002

git-svn-id: http://src.chromium.org/chrome/trunk/tools/depot_tools@292818 4ff67af0-8c30-449e-8e8b-ad334ec8d88c
Delete before cp in download_from_google_storage

BUG=

Review URL: https://codereview.chromium.org/696023002

git-svn-id: http://src.chromium.org/chrome/trunk/tools/depot_tools@292819 4ff67af0-8c30-449e-8e8b-ad334ec8d88c
Adding myself as an owner.

BUG=

Review URL: https://codereview.chromium.org/697283002

git-svn-id: http://src.chromium.org/chrome/trunk/tools/depot_tools@292820 4ff67af0-8c30-449e-8e8b-ad334ec8d88c