Add manifest to FILES.cfg. This should allow chrome.exe to run out of the chrome-win32 archive.

This is a recommit of r235515.

TBR=laforge

BUG=319237
TEST=NONE
NOTRY=TRUE

Review URL: https://codereview.chromium.org/76913006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@236253 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 236253