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This CL inverts the relationship between |currentBVC| and |currentBrowserCoordinator|.
This CL makes |currentBrowserCoordinator| the source of truth, and |currentBVC| simply
returns the corresponding BVC.

Change-Id: Ibdcb79ca3f6fb2f3c2d8cecae1be036c58962dae
Reviewed-on: https://chromium-review.googlesource.com/c/1355995Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Reviewed-by: edchin <edchin@chromium.org>
Commit-Queue: edchin <edchin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#613140}