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This CL hooks up a skeleton Site Settings UI, which for now just shows
a single string. The focus of this CL is hooking up the RemoteFragment.
Hooking up the UI Fragments themselves will be in a followup.

Bug: 1049683
Change-Id: Ie9d79d928655067565a90ef96b5cc49dba591c7e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2199986Reviewed-by: Richard Coles <torne@chromium.org>
Reviewed-by: Bo <boliu@chromium.org>
Commit-Queue: Robbie McElrath <rmcelrath@chromium.org>
Cr-Commit-Position: refs/heads/master@{#769017}