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The Linux sandbox causes created files to be automatically deleted once
they are closed.  This means that creating a file without leaving an
open file handle is useless afterwards for any subsequent calls
expecting it to exist with results of previous work.

Change ParsePpdCapabilities() to open a stream for a temporary file and
keep that open for the duration of the file operations, instead of
doing multiple open/close operations against a common filename.  This
is necessary for supporting sandboxing of the print backend in a
utility process.

Bug: 809738
Change-Id: Id16dc686873decad7be980ce4621747b4233184a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2597143Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
Reviewed-by: Daniel Hosseinian <dhoss@chromium.org>
Commit-Queue: Alan Screen <awscreen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#839166}