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Also add missing dependency for fallback impl.

Cq-Include-Trybots: master.tryserver.chromium.android:android_cronet_tester
Change-Id: I8c568bb1bc10cb0aac3df0588e93840bcb05b2bf
Reviewed-on: https://chromium-review.googlesource.com/1047370Reviewed-by: Andrei Kapishnikov <kapishnikov@chromium.org>
Commit-Queue: Paul Jensen <pauljensen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#556477}