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Support creation and deletion of apps as a part of single update.

RegisterApp, UnregisterApp and UnregisterAll methods now can be expressed
within one WebAppRegistryUpdate (one transaction).

Report kWriteDataFailed in InstallFinalizer if commit fails.

WebAppRegistryUpdate CreateApp/UpdateApp/DeleteApp is now the only
writable database API (as in Database CRUD: Create/Update/Delete).

Bug: 860583
Change-Id: Ia2e23a4d4a0d47e62b815abd55803616a204e813
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1824043Reviewed-by: Alan Cutter <alancutter@chromium.org>
Commit-Queue: Alexey Baskakov <loyso@chromium.org>
Cr-Commit-Position: refs/heads/master@{#700088}