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This CL removes code paths of unused bubble view modes in
ProfileMenuView and refactors related code.

Bug: 966388
Change-Id: Icece4828989c61d8be9ac85de27874d934fa92ed
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1751788Reviewed-by: Marc Treib <treib@chromium.org>
Commit-Queue: Thomas Tangl <tangltom@chromium.org>
Cr-Commit-Position: refs/heads/master@{#686449}