Reason for revert:
This CL over-aggressively removed the Windows bootstrap code used by /gclient.bat, which in turn downloads/installs the Windows toolchain, including Python. Labs can no longer provision Windows bots because of this.
update_depot_tools.bat did more than initialize the virtualenv. It also downloaded and installed Python, Git, and Subversion on Windows systems.
I'm reverting to restore the toolchain so we can create new Windows bots.
Original issue's description:
> Removed virtualenv from depot_tools
>
> This effectively reverts http://crrev.com/1195423002 and
> http://crrev.com/1205873002.
>
> R=pgervais@chromium.org, tandrii@chromium.org
> TBR=pgervais@chromium.org # i wanna get my Fixit credit today :-)
> BUG=542922,503067
>
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=297491
TBR=pgervais@chromium.org,tandrii@chromium.org,sergiyb@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=542922,503067
Review URL: https://codereview.chromium.org/1431173002 .
git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@297493 0039d316-1c4b-4281-b951-d872f2087c98
2.7.5 has bug http://bugs.python.org/issue17998 in re package that is affecting
the chromium team so it can't be used. The bug is fixed in 2.7.6.
This update still respects DEPOT_TOOLS_PYTHON_275=0. Since the name doesn't
represent what is being installed, it also respects
DEPOT_TOOLS_PYTHON_27=0.
R=iannucci@chromium.org
BUG=241769
Review URL: https://codereview.chromium.org/73013003
git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@235384 0039d316-1c4b-4281-b951-d872f2087c98
dnj@google.com
sergiyb@chromium.org
maruel@chromium.org