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Fuchsia packages are cached rather than installed into a device's
package filesystem, and when resolving packages the system is at liberty
to return a cached package that may be older than the version that had
previously been run, if the package server is unavailable.

Ensure that the package server remains running for the duration of
RunPackage(), to ensure that the expected version is run.

Bug: 956100, fuchsia:49180
Change-Id: I4aeacbf451f5c2bde84e16b3ea35461d2b88fa4b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2127368
Commit-Queue: Wez <wez@chromium.org>
Auto-Submit: Wez <wez@chromium.org>
Reviewed-by: Kevin Marshall <kmarshall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#754690}