Revert 15861 because of

 File "D:\b\depot_tools\bootstrap\\..\gclient.py", line 446, in SubprocessCallAndCapture
   out.write(in_byte)

TBR=nsylvain
Review URL: http://codereview.chromium.org/115244

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@15862 0039d316-1c4b-4281-b951-d872f2087c98