Remove WebNavigationParams::source_location

There are no users of this information left. Originally, some CSP
error messages used it, but those moved to the browser process.

Bug: none
Change-Id: I1fa29e49fe61b6a3c1fbf3a57906c327dbc8b1a5
Reviewed-on: https://chromium-review.googlesource.com/c/1424421
Reviewed-by: Arthur Sonzogni <arthursonzogni@chromium.org>
Commit-Queue: Dmitry Gozman <dgozman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#624874}
5 files changed