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This CL removes PhoneHubManager::Get(), and instead provides
PhoneHubManager to //ash via new function
SystemTray::SetPhoneHubManager().

This function is left as a TODO for now; a follow-up CL will use the
provided PhoneHubManager pointer to render the UI in //ash.

Bug: 1106937
Change-Id: I4a69d700d4e086d3e59ceaaf5ae1a364824a3633
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2368485Reviewed-by: James Cook <jamescook@chromium.org>
Commit-Queue: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#800779}