Revert of bot_update: add depot_tools to PATH so that e.g. apply_issue can be found

Revert of bot_update: add depot_tools to PATH so that e.g. apply_issue can be found (patchset #1 id:1 of https://codereview.chromium.org/1660943002/ )

Reason for revert:
I believe this breaks trybot patching on Windows. 

Example: https://build.chromium.org/p/tryserver.webrtc/builders/win_x64_gn_rel/builds/6811

Error: 
'E:\b\build\scripts\slave\.recipe_deps\depot_tools\python' is not recognized as an internal or external command,
operable program or batch file.

I'm speculatively reverting.

Original issue's description:
> bot_update: add depot_tools to PATH so that e.g. apply_issue can be found
> 
> BUG=437264
> 
> Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=298556

TBR=jochen@chromium.org,phajdan.jr@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=437264
Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=298561

[kjellander_chromium, 2016-02-03 15:33:47]

Created Revert of bot_update: add depot_tools to PATH so that e.g. apply_issue
can be found

[commit-bot: I haz the power, 2016-02-03 15:33:55]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1662763003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1662763003/1

[commit-bot: I haz the power, 2016-02-03 15:34:14]

Description was changed from

==========
Revert of bot_update: add depot_tools to PATH so that e.g. apply_issue can be
found (patchset #1 id:1 of https://codereview.chromium.org/1660943002/ )

Reason for revert:
I believe this breaks trybot patching on Windows. 

Example:
https://build.chromium.org/p/tryserver.webrtc/builders/win_x64_gn_rel/builds/...

Error: 
'E:\b\build\scripts\slave\.recipe_deps\depot_tools\python' is not recognized as
an internal or external command,
operable program or batch file.

I'm speculatively reverting.

Original issue's description:
> bot_update: add depot_tools to PATH so that e.g. apply_issue can be found
> 
> BUG=437264
> 
> Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=298556

TBR=jochen@chromium.org,phajdan.jr@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=437264
==========

to

==========
Revert of bot_update: add depot_tools to PATH so that e.g. apply_issue can be
found (patchset #1 id:1 of https://codereview.chromium.org/1660943002/ )

Reason for revert:
I believe this breaks trybot patching on Windows. 

Example:
https://build.chromium.org/p/tryserver.webrtc/builders/win_x64_gn_rel/builds/...

Error: 
'E:\b\build\scripts\slave\.recipe_deps\depot_tools\python' is not recognized as
an internal or external command,
operable program or batch file.

I'm speculatively reverting.

Original issue's description:
> bot_update: add depot_tools to PATH so that e.g. apply_issue can be found
> 
> BUG=437264
> 
> Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=298556

TBR=jochen@chromium.org,phajdan.jr@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=437264

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=298561
==========

[commit-bot: I haz the power, 2016-02-03 15:34:15]

Committed patchset #1 (id:1) as
http://src.chromium.org/viewvc/chrome?view=rev&revision=298561