Allow ppapi utility process to access fonts on Windows

Change windows sandbox policy to allow ppapi utility process to
access font directory in file system. Also set pdf compositor
service's sandboxing type as ppapi so it can access font system
on various platforms.

BUG=455764

Change-Id: I356ddfe57e172e90a6d6deaf4bcf6d39dc1b5b97
Reviewed-on: https://chromium-review.googlesource.com/682767
Reviewed-by: Will Harris <wfh@chromium.org>
Commit-Queue: Wei Li <weili@chromium.org>
Cr-Commit-Position: refs/heads/master@{#504288}
2 files changed