Don't invoke ConnectToService factory on invalid handles
Don't invoke ConnectToService factory on invalid handles

This prevents ServiceRegistryImpl from invoking service
factories on invalid interface requests, since it's possible
to receive an invalid handle under certain conditions (see
discussion on https://codereview.chromium.org/1399883003/).

BUG=542062,534719
R=jam@chromium.org

Review URL: https://codereview.chromium.org/1399883004

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#353622}

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