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This CL extends WebAppUiManagerImpl::UninstallAndReplace() to also
migrate the following user preferences:
 - chrome://apps grid position.
 - standalone/browser tab launch preference.

Pre-migration screenshot:
https://bugs.chromium.org/p/chromium/issues/attachment?aid=462010&signed_aid=oHAn32fAhc9IyNofMQ7C9Q==&inline=1

Post-migration screenshot before:
https://bugs.chromium.org/p/chromium/issues/attachment?aid=462009&signed_aid=LhJc8aoValNlvgCzMUSiUg==&inline=1

Post-migration screenshot after:
https://bugs.chromium.org/p/chromium/issues/attachment?aid=462008&signed_aid=cvtBWSuplfvc9sMKp2XvCw==&inline=1

Bug: 1105338
Change-Id: I908d11870c940f27485ac1436570659313ae794f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2358938Reviewed-by: Daniel Murphy <dmurph@chromium.org>
Commit-Queue: Alan Cutter <alancutter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#798906}