GitLab

r302898 made FontRenderParams avoid calling FcFontMatch()
for empty queries, instead just sticking to the default
pattern. Many users don't have sane default patterns,
though, so instead call FcConfigSubstituteWithPat() to load
settings that aren't tied to particular font families.

Also use scoped_ptr to simplify FcPattern management and add
myself as an owner for font_render_params*.

BUG=442443,435277,423056

Review URL: https://codereview.chromium.org/811123002

Cr-Commit-Position: refs/heads/master@{#309560}