Fix a regression due to sandbox type change

The direct write message filter should be used for pdf
compositor only in utility process host.

BUG=455764

Change-Id: I939f5568c783f4e460ac399532581ed2b789dcc5
Reviewed-on: https://chromium-review.googlesource.com/742687
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Commit-Queue: Wei Li <weili@chromium.org>
Cr-Commit-Position: refs/heads/master@{#512605}
1 file changed