[SyncFS] Do not activate unsupported files

BUG=240165

Review URL: https://codereview.chromium.org/109283003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@240128 0039d316-1c4b-4281-b951-d872f2087c98
Removing GetDefaultProfile from policy browser tests

This is part of the effort to get rid of GetDefaultProfile.

BUG=322682
TEST=none, using existing unittests

Review URL: https://codereview.chromium.org/111933010

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@240129 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 240129