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BrowserContext is sufficient and is one step closer to componentizing
the class.

Bug: 1147276
Change-Id: Ifa05a35c71ca601a52c54d7a428f54f0abdc149e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2527856Reviewed-by: Dominick Ng <dominickn@chromium.org>
Commit-Queue: Evan Stade <estade@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827136}