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More functionality is about to be added into this button so it's no
longer appropriate to bundle it into ToolbarView. Doing this as a
separate step to avoid large patches.

Bug: chromium:822070
Change-Id: I07f690ebeefa29f4ac4177cb59785bab01a56f0b
Reviewed-on: https://chromium-review.googlesource.com/1008628
Commit-Queue: Peter Boström <pbos@chromium.org>
Reviewed-by: Bret Sepulveda <bsep@chromium.org>
Cr-Commit-Position: refs/heads/master@{#550484}