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This CL adds support for Shortcuts Menu to be updated when an installed
PWA's manifest is updated.

Code in manifest_update_task.cc detects changes to the shortcuts member
of the manifest. It then triggers a reinstallation of the PWA per the
new info in the manifest.

As part of this flow we Unregister the existing Shortcuts Menu with the
OS and then Reregister it as part of the reinstallation flow.

To help detect changes in the manifest, this CL adds new methods to
AppRegistrar that help read existing ShortcutsMenu related info. These
methods have been implemented for both BookmarkApp and WebApp systems.

Testing: This CL adds Shortcuts Menu related browser tests in
manifest_update_manager_browsertest.cc. It also adds new tests in
web_app_install_task_unittest.cc for invoking UpdateWebAppFromInfo with
Shortcuts Menu data.

Design doc: https://docs.google.com/document/d/1KhHWikx1z-604LIjDKEdnL9MyezJklxM8kEYNnMLIQs/

Bug: 1087212
Change-Id: Ie825494ab137724e07e55bc12098cbfb386fb6ba
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2244111Reviewed-by: Alexey Baskakov <loyso@chromium.org>
Reviewed-by: Alan Cutter <alancutter@chromium.org>
Commit-Queue: Rahul Singh <rahsin@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#780214}