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BrowserTabsModel contains metadata about the two most-recently-used
browser tabs on the user's phone. This class is now integrated with the
high-level PhoneModel class.

There is still no code to set the fields within this new model; this
will come in a future CL.

Bug: 1106937
Change-Id: I972aed6c69de33dc733cf52686d660e9465030cb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2368075
Commit-Queue: Scott Violet <sky@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Regan Hsu <hsuregan@chromium.org>
Auto-Submit: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#800587}