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Since we dropped support for rendering Type 1 fonts in Chrome, we should
filter the list of fonts that can be configured as defaults to only
display fonts that have the right font format, i.e. TrueType or CFF.

A a side effect, this allows us to build the font list enumeration for
ozone as well, as it is only dependent on Fontconfig after this CL, not
dependent on Pango anymore.

For backwards compability with the old implementation, we're adding
three Fontconfig alias families Sans, Serif and Monospace to the list,
since our default settings on Linux included the "Monospace" family for
the fixed width font.

BUG=630508,457307

Review-Url: https://codereview.chromium.org/2278143002
Cr-Commit-Position: refs/heads/master@{#414677}