GitLab

With this CL, we ignore font files with .fon/.pfm/.pfb extensions while building our custom font collection.
MSDN Ref: http://goo.gl/TfCOA

BUG=439571
R=cpu@chromium.org,scottmg@chromium.org

Review URL: https://codereview.chromium.org/1034813003

Cr-Commit-Position: refs/heads/master@{#322470}