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It allows BookmarkAppInstallFinalizer to mimic the "atomic write" of the
web app into the registry (BookmarkAppRegistrar).

The ideal behavior should match WebAppInstallFinalizer (that's our
future):
WebAppInstallFinalizer does real atomic write to disk (LevelDB) and
registers the web app in WebAppRegistrar.

Bug: 901226
Change-Id: Iaf9840cf02e9027f2822426c089a0b7a4e62803c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1732700
Commit-Queue: Alexey Baskakov <loyso@chromium.org>
Reviewed-by: Alan Cutter <alancutter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#683921}