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As ChromeBrowserState has been moved to the global namespace and
all client code fixed, the code added to support the incremental
migration can be removed.

Bug: 1042208
Change-Id: I35a69dfcf6256f0990ec3b3deeb847fa3a7c4ab2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2026976Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Auto-Submit: Sylvain Defresne <sdefresne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#736909}