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The incognito menu code is moved into ProfileMenuView
because there is a lot of shared code with regular and
guest mode. This also removes special casing during the
bubble creation.

Screenshot:
https://drive.google.com/file/d/1JeyIWItOqCnQ7dJAWI_q0eD0zkaFPIPr/view?usp=sharing

Flag: profile-menu-revamp

Bug: 995720
Change-Id: Id2778759dbe83a342cb8a0261f74d3ece4572d29
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1819444
Commit-Queue: Thomas Tangl <tangltom@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#698930}