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We used to only consider filters if they had something to filter.
However, this means that if there is a filter with a name prefix we do
not consider it as Android does not have a name prefix filter. Since
the filters are unioned together, missing a filter could cause results
we are looking for to be filtered out. To ensure this does not happen
we are adding an open filter to replace the name prefix filter instead
of disregarding it entirely. Therefore we never filter out a result
which should pass through the name prefix filter.

Bug: 1121697
Change-Id: Ib6f4ff52978c62e0a5f16056524459f1116576a4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2389340
Commit-Queue: James Hollyer <jameshollyer@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#815902}