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This CL cleans up resource_request_detector.{cc,h} and
ServicesDelegate::ProcessResourceRequest() along with
all the production and test code related to it.

Bug: 1059639
Change-Id: I353b6beecee4e6c00b06fdc8612f4ca2c00b459f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2560185Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Daniel Rubery <drubery@chromium.org>
Commit-Queue: Julie Kim <jkim@igalia.com>
Cr-Commit-Position: refs/heads/master@{#834546}