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This CL updates the trailing button displayed in the omnibox popup rows.
- The asset for the Switch to Open Tab button is updated.
- The color is changed, including the system button effect on highlight.
- The previous assets used before UI Refresh are removed.

Bug: 908777
Change-Id: I5c0b0d906089fc630824115a4e0b35d6d905c8f4
Reviewed-on: https://chromium-review.googlesource.com/c/1352151Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Reviewed-by: Stepan Khapugin <stkhapugin@chromium.org>
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#613055}