Revert 237623 "Default msvs_cygwin_shell to 0"

Broke
http://build.chromium.org/p/chromium.webkit/builders/Win%20Builder/builds/44940/steps/compile/logs/stdio#error1

remoting_copy_locales, or something.

> Default msvs_cygwin_shell to 0
> 
> This will cause all rules that do not have msvs_cygwin_shell: 1 to run
> using cmd.exe.
> 
> R=iannucci@chromium.org
> BUG=123026
> 
> Review URL: https://codereview.chromium.org/86703002

TBR=scottmg@chromium.org

Review URL: https://codereview.chromium.org/92873002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@237628 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 237628