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This CL moves some of c.b.toolbar/ classes in the core build target
to a new modularized one under chrome/browser/toolbar. The rest
still stay in the core target due to direct or indirect references
to dependencies such as omnibox.

Bug: 1127732
Change-Id: I160deef07817b05dfd8e22adbd65225456de29ac
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2592277
Commit-Queue: Jinsuk Kim <jinsukkim@chromium.org>
Reviewed-by: Theresa  <twellington@chromium.org>
Cr-Commit-Position: refs/heads/master@{#840052}