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This patch removes the force stacking of tabs when touch optimized
chrome is enabled and restores the old approach.

Bug: 844193
Change-Id: Icf591860d06afe4698817291f70d619343237a82
Component: Touchable chrome, tabstrip, tab stacking
Reviewed-on: https://chromium-review.googlesource.com/1066864
Commit-Queue: Malay Keshav <malaykeshav@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#560292}