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This patch adds a check for |locally_installed| in the post-finalize
step of the WebAppInstallTask callback chain. Instead of calling
InstallOsHooks, it skips that (as the web app is not locally installed).

This also updates the TestOsIntegrationManager to store a little more
data, and make the TestWebAppProviderCreator take a RepeatingCallback
to support multiple profiles.

TBR: loyso@chromium.org
Bug: 1143023
Change-Id: I18f3864e909980a892f6f669fa4029b098b43d01
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2505685
Commit-Queue: Daniel Murphy <dmurph@chromium.org>
Reviewed-by: Phillis Tang <phillis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#824979}