Linux: Remove PrefService.FileSystemType histogram.

The answer is < 1% networked file systems, ~5% "other".

Review URL: https://codereview.chromium.org/134073004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@248937 0039d316-1c4b-4281-b951-d872f2087c98
Clean-up: Replaces obsolete Font/FontList methods.

Replaces obsolete methods of gfx::Font and gfx::FontList with new ones.

ui::ResourceBundle::SmallFont is equivalent to -1px to the default font.  So, nothing changes.

BUG=265485
TEST=Run ui_unittests.

Review URL: https://codereview.chromium.org/152723002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@248938 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 248938