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Currently TooltipAura creates a single TooltipView for its tooltips
and shares this single instance between transient instances of Widget
which are created as needed.

This patch changes the behavior such that a new TooltipView is
created for each new TooltipAura Widget. This ensures that each
Widget hierarchy can assert ownership over its View tree in alignment
with current Views best practices.

Bug: 1044687
Change-Id: I8441ec4264c012d00bd68fd5c7a1d15113e02246
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2212800Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Thomas Lukaszewicz <tluk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#771937}