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This CL updates the OsIntegrationManager::UninstallOsHooks() method to
accept an additional |os_hooks| parameter to specify which OS Hooks to
uninstall.

This CL is in preparation to allow Run on OS Login to be enabled/disabled
by the user after the web app is installed, via the
OsIntegrationManager::UninstallOsHooks() API. Currently there is no way
to uninstall an OS Hook (i.e. Run on OS Login) individually.

This CL consists of the following changes:

1. Update OsIntegrationManager::UninstallOsHooks() to honor the passed
    |os_hooks| and only uninstall the specified OS hooks.

2. Add OsIntegrationManager::UninstallAllOsHooks() API to be replaced in
    places that currently call UninstallOsHooks() with the intention to
    effectively uninstall all OS hooks.


Bug: 1121372
Change-Id: Ie294f61b9518e997bf4192ac1bdcb7db5bf819fb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2372819
Commit-Queue: Carlos Frias <carlos.frias@microsoft.com>
Reviewed-by: Alexey Baskakov <loyso@chromium.org>
Cr-Commit-Position: refs/heads/master@{#807652}