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If the split cache is enabled, do not attempt to call
DoomMainEntryForUrl if the network_isolation_key (NIK) is unpopulated.
This previously would occur for requests in HttpCacheLookupManager, but
the cache is bypassed for these requests, making the call unnecessary.
When the call was made, a DCHECK was hit in GenerateCacheKey given the
empty NIK.

Bug: 1014077
Change-Id: I566d021d50ea7200d8d99702e382c7db932dfe44
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1860312Reviewed-by: Shivani Sharma <shivanisha@chromium.org>
Commit-Queue: Alex Turner <alexmt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#705988}