This causes an excepiton on Windows,
  File "E:\b\depot_tools\subprocess2.py", line 341, in communicate
TypeError: Using timeout and shell simultaneously will cause a process leak
since the shell will be killed instead of the child process.

TBR=petermayo@chromium.org
BUG=


Review URL: https://chromiumcodereview.appspot.com/11368148

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@166732 0039d316-1c4b-4281-b951-d872f2087c98