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This CL removes clickjacking.launch_url which was added back in 2009.
I suspect nobody is actively looking at it, so it seems safe to delete.

Change-Id: I088c115e2811c18a993385d86ca44a58ed449da5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1873110Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Commit-Queue: Mustafa Emre Acer <meacer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709110}