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This patch moves `X-Frame-Options` parsing out of AncestorThrottle, and
into the network.mojom.ParsedHeaders struct so that it's parsed along
with other headers that affect how we load resources during navigation.

Bug: 1153274
Change-Id: I2287de1f2610cb79a6dd4d37de6f3128c2c2b72f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2563489
Commit-Queue: Mike West <mkwst@chromium.org>
Reviewed-by: Antonio Sartori <antoniosartori@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Reviewed-by: Arthur Sonzogni <arthursonzogni@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#832392}