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Support for file-based persistence was removed in r571588,
so its no longer necessary for Cronet to explicitly create
a CertVerifier to guarantee it is a CachingCertVerifier.

Bug: 590875
Cq-Include-Trybots: master.tryserver.chromium.android:android_cronet_tester;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: I23e9e6db12225a7474ce589d9333595729108f1c
Reviewed-on: https://chromium-review.googlesource.com/1169822Reviewed-by: Helen Li <xunjieli@chromium.org>
Commit-Queue: Ryan Sleevi <rsleevi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#582330}