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This CL converts FrameMsg_EnforceInsecureRequestPolicy to method on
blink RemoteFrame mojom. It also updates the unit test with
intercepting RemoteFrame and removes checking the IPC message.

BUG=1047284

Change-Id: I9578c49cfcc08b3a682ec2899627dc6503965654
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2038513Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Julie Kim <jkim@igalia.com>
Cr-Commit-Position: refs/heads/master@{#743924}