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Collected cookies when invoked from the site info bubble (padlock ->
Cookies -> click the "X in use" link) is already hooked up to
--secondary-ui-md. However, it can also be shown via the content
settings bubble when a cookie is blocked.

We also need TabDialogs' Signin confirmation dialog switched to Harmony,
so set up a way to show Harmony dialogs from the TabDialogs interface.

Opt collected cookies into DialogBrowserTest to make it easy to invoke
for testing.

BUG=654151, 677012, 610428

Review-Url: https://codereview.chromium.org/2534743002
Cr-Commit-Position: refs/heads/master@{#443130}