Remove deprecated --msvs-version flag which is no longer used anywhere.
Remove deprecated --msvs-version flag which is no longer used anywhere.

R=scottmg@chromium.org

Review URL: https://codereview.chromium.org/27522004
old8xp/gyp_from_google,old8xp/gyp_from_google,old8xp/gyp_from_google,old8xp/gyp_from_google,old8xp/gyp_from_google