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This reverts commit 6d6b6173.

Reason for revert: Suspected of breaking the Mac builder:
https://ci.chromium.org/p/chromium/builders/luci.chromium.ci/Mac%20Builder/89748

This code doesn't seem obviously related to the webui failure there, but there are no other webui CLs in the blame list.

Original change's description:
> Add the ability for AndroidSmsAppHelperDelegate to launch the PWA.
> 
> Also actually use this ability when the "Set Up" button in multidevice
> settings is clicked.
> 
> R=​khorimoto@chromium.org
> 
> Bug: 870093
> Change-Id: I3dd5bcd9c8e3946e1ae42a5db69f2bb7ed3ea586
> Reviewed-on: https://chromium-review.googlesource.com/1185498
> Commit-Queue: Jeremy Klein <jlklein@chromium.org>
> Reviewed-by: Tommy Li <tommycli@chromium.org>
> Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#589196}

TBR=khorimoto@chromium.org,tommycli@chromium.org,jlklein@chromium.org

Change-Id: I855abd7c530600362082c83ee155aaa3d713415f
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 870093
Reviewed-on: https://chromium-review.googlesource.com/1211382Reviewed-by: Justin Donnelly <jdonnelly@chromium.org>
Commit-Queue: Justin Donnelly <jdonnelly@chromium.org>
Cr-Commit-Position: refs/heads/master@{#589218}