Only refer to _WIN resources on Windows.

The code only works as is because GRIT does not properly respect an 'is_win' conditional.

Review URL: https://codereview.chromium.org/133563002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@244316 0039d316-1c4b-4281-b951-d872f2087c98
[Supervised users] Disable syncing shared settings for now.

BUG=333179

Review URL: https://codereview.chromium.org/133623002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@244317 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 244316
SVN changes up to revision 244317