[iOS] Stop whitelisting for resources from //net.
[iOS] Stop whitelisting for resources from //net.

Stop using whitelisting for resources from //net as this not useful
(iOS uses //net unmodified downstream).

BUG=None

Review URL: https://codereview.chromium.org/1390003004

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#355242}

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