OnDidLoadResourceFromMemoryCache notifies network service cache correctly

OnDidLoadResourceFromMemoryCache calls new NotifyExternalCacheHit
when network service is active as to properly update the cache with an external hit.

Bug: 893323
Change-Id: Ia21b3441122a55d8eb5a8c7e508b4243ab500cda
Reviewed-on: https://chromium-review.googlesource.com/c/1366435
Commit-Queue: Steven Bingler <bingler@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Bence Béky <bnc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#615956}
9 files changed