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It is a known limitation that http cache lookup based on a push will not
be supported when split cache is enabled because the network isolation
key (top frame origin, frame origin) is not available for such a request.

We add an early return to the following three previously failing tests
in the suite HttpCacheLookupManagerTest*:
ServerPushHitCache
ServerPushLookupOnUrl
ServerPushPendingLookup

Bug: 1009619
Change-Id: I48b3e5d89c3b6228d189da9daa4e5714ad1e1602
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1853825Reviewed-by: Shivani Sharma <shivanisha@chromium.org>
Commit-Queue: Cammie Smith Barnes <cammie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#704778}