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These interfaces were hidden within //content but depended upon from
//chrome/browser. This clarifies the layering issues present but does
not completely fix them (see additions to DEPS). It does also resolve
`gn check` errors in //chrome/browser.

Specifically, profile_provider_chromeos.h includes jank_monitor.h
(holds a pointer and is an observer) and
chrome_metrics_service_client.cc includes
accessibility_metrics_provider.h (only to create one).
Let me know if there's a better way to layer this.

Split out from crrev.com/c/2383400

Bug: 898837
Change-Id: I4786b903e52164841d91b431d3bcd2cabc2df54e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2383515
Commit-Queue: Glen Robertson <glenrob@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#803751}