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The gn check errors that remain after this change are things like
/c/b/m/router files including /c/browser files, but /c/b/m/router
depending on /c/browser would be a circular dependency.  This is
mostly due to siblings of Media Router that don't have their own
target underneath /c/browser and go directly into /c/browser:browser.

Bug: 740319
Change-Id: Iee4a9594356c1959c26ff88e154da62e3f418831
Reviewed-on: https://chromium-review.googlesource.com/758812Reviewed-by: Wez <wez@chromium.org>
Commit-Queue: Brandon Tolsch <btolsch@chromium.org>
Cr-Commit-Position: refs/heads/master@{#515009}