Roll DEPS to skia r198. This picks up a number of bugfixes for layout tests,

and font stuff for Linux.  Rebaselines affected tests, adjusts
test_expectations, and removes an extraneous include dir.  (Also sets the
svn:mime-type prop on some of the linux PNG files; they still diff as text
in rietveld this time, but I think they should be happier for next time.)

BUG=http://crbug.com/12002
TEST=If it builds, and layout tests pass, you're happy.

Review URL: http://codereview.chromium.org/118128

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@17434 0039d316-1c4b-4281-b951-d872f2087c98