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[App Management] Copy App Management assets.

This CL copies files from c/b/r/app_management into
c/b/r/settings/chromeos/os_apps_page/app_management_page.

Bug: 979531
Change-Id: Ibfb4cdb7201743f86c6601b8a1c97f2bd0f6a597
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1752497
Commit-Queue: Jeevan Shikaram <jshikaram@chromium.org>
Auto-Submit: Jeevan Shikaram <jshikaram@chromium.org>
Reviewed-by: calamity <calamity@chromium.org>
Cr-Commit-Position: refs/heads/master@{#690002}