Revert of Remove now-unnecessary msvs_cygwin_shell (https://codereview.chromium.org/139303024/)

Reason for revert:
I can't build on Windows with MSVC... but when I revert this CL, I can at least get past this part of the build failure.

Lots of developers use MSVC... so please don't disable it.

Original issue's description:
> Remove now-unnecessary msvs_cygwin_shell
> 
> Added https://src.chromium.org/viewvc/chrome?view=rev&revision=237636
> but now unnecessary since we build on ninja everywhere.
> 
> TBR=wez@chromium.org
> BUG=123026
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=245747

TBR=wez@chromium.org,scottmg@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=123026

Review URL: https://codereview.chromium.org/142953002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@245856 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 245856