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This CL adds a config parameter "only_for_new_users" which prevents
installation of a default web app if the user profile has used Chrome
already. This allows us to specifically target new users only for
new default web app rollouts.

Bug: 1145032
Change-Id: Id222d359b9bf9645e676de12ef9ea23039710a46
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2515931
Commit-Queue: Alan Cutter <alancutter@chromium.org>
Reviewed-by: Glen Robertson <glenrob@chromium.org>
Cr-Commit-Position: refs/heads/master@{#823482}