Winson 8f6ee48225 Completely removing dead code related to history view.
- This CL repurposes the history button above the stack to a more
  generic “stack action” button in preparation for a future change.

Bug: 27742174
Change-Id: I1da274bf88c77bdc09d91072683b2ea7ca022432
2016-03-23 18:49:22 -07:00
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