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This reverts commit 1ee2c9ad.

Reason for revert: sorry, let me revert this one too to successfully
revert the other one. (This can probably be re-landed after that)

Original change's description:
> Fix some DefaultFrameHeader semantics.
> 
> This CL removes back button as a constructor arg and renames the
> setters for the back button and the left header view to set_property to
> clarify the semantics of the methods.
> 
> Bug: None
> Change-Id: Ia73a173696ff434bc4e96168c82ed95fce6dd6e9
> Reviewed-on: https://chromium-review.googlesource.com/778265
> Commit-Queue: calamity <calamity@chromium.org>
> Reviewed-by: James Cook <jamescook@chromium.org>
> Reviewed-by: Trent Apted <tapted@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#519599}

TBR=jamescook@chromium.org,tapted@chromium.org,calamity@chromium.org

Change-Id: I43ef07f352e96d1040594066822449d806c4e91e
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: None
Reviewed-on: https://chromium-review.googlesource.com/792734
Commit-Queue: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#519642}