Roll Skia to r607 to pick up font fixes.

      BUG=59320
TEST=layout
TBR=senorblanco

Review URL: http://codereview.chromium.org/3838007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@63010 0039d316-1c4b-4281-b951-d872f2087c98