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This change allows code outside of c/b/ui/views to access the main
AcceleratorProvider (which happens to be BrowserView on desktop
platforms).

Bug: 1041639
Change-Id: I20167475c769ba3921e20ddd0cc8419aad839edc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2399444Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Commit-Queue: Leonard Grey <lgrey@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805323}