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This CL updates how a web app's launch URL is computed given a
launch_query_params configuration. If the launch_query_params are
already present in the start_url then they are not appended a second
time.

Bug: 1142701
Change-Id: I394c8d96ee5e6a3776ed0c3555167b672b5e50b6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2501107
Commit-Queue: Alan Cutter <alancutter@chromium.org>
Reviewed-by: Glen Robertson <glenrob@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821638}