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This CL fixes an issue where the app list would launch new instances of
the Settings App because it didn't run through the same System Web App
launch code path that the rest of Chrome OS does.

Bug: 1012558
Change-Id: I60aead0adee4cc13082648ae67a50a03f811f673
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1868354Reviewed-by: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Reviewed-by: Ben Wells <benwells@chromium.org>
Commit-Queue: calamity <calamity@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710199}