Try to fix runhooks_wrapper.py on Windows after r263959.

Try to fix runhooks_wrapper.py on Windows after r263959.

It's currently failing on Windows:
http://build.chromium.org/p/chromium.fyi/builders/Chromium%20Win%20Ninja%20Goma%20%28shared%29/builds/27608/steps/runhooks/logs/stdio

gclient runhooks
Traceback (most recent call last):
  File "..\..\..\scripts\slave\runhooks_wrapper.py", line 49, in <module>
    sys.exit(main())
  File "..\..\..\scripts\slave\runhooks_wrapper.py", line 45, in main
    return chromium_utils.RunCommand(['gclient', 'runhooks'])
  File "C:\b\build\scripts\common\chromium_utils.py", line 868, in RunCommand
    bufsize=0, **kwargs)
  File "C:\b\depot_tools\python276_bin\lib\subprocess.py", line 709, in __init__
    errread, errwrite)
  File "C:\b\depot_tools\python276_bin\lib\subprocess.py", line 957, in _execute_child
    startupinfo)
WindowsError: [Error 2] The system cannot find the file specified

BUG=332697
TBR=iannucci@chromium.org

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=263974

[Nico, 2014-04-15 19:46:43]

The CQ bit was checked by thakis@chromium.org

[commit-bot: I haz the power, 2014-04-15 19:46:55]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/thakis@chromium.org/239153006/1

[commit-bot: I haz the power, 2014-04-15 19:47:45]

Change committed as 263974

[iannucci, 2014-04-15 19:58:35]

On 2014/04/15 19:47:45, I haz the power (commit-bot) wrote:
> Change committed as 263974

lgtm

Did this fix it? Looks like yes?

[iannucci, 2014-04-15 19:59:11]

On 2014/04/15 19:58:35, iannucci wrote:
> On 2014/04/15 19:47:45, I haz the power (commit-bot) wrote:
> > Change committed as 263974
> 
> lgtm
> 
> Did this fix it? Looks like yes?

Ah, yeah, because either you need shell=True or 'gclient.bat'

[Nico, 2014-04-15 20:14:07]

Yes, this helped. (Sorry, I left the "this helped" comment on the other review.)