Clean-up: Retires obsolete Font methods of RenderText.

Removes obsolete gfx::Font versions of methods in gfx::RenderText.

BUG=265485
TEST=Run unit_tests, ui_unittests, views_unittests

Review URL: https://codereview.chromium.org/120983004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@242706 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 242706