[Companion] Remove URLs from request when not an HTTP/HTTPS page.

This ensures the companion returns the empty zero state when the main
content is not an HTTP/HTTPS page.

Bug: b/275452360
Change-Id: I7dbf0841bf5a5219b5ca832a78bbb4a3673872e6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4376200


Reviewed-by: Ali Stanfield <stanfield@google.com>
Commit-Queue: Michael Crouse <mcrouse@chromium.org>
Reviewed-by: Shakti Sahu <shaktisahu@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1123185}