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This ensures that the MediaToolbarButtonView, which inherits from
ToolbarButton, gets the promo highlight. Before this change, the promo
highlight was only applied to the BrowserAppMenuButton.

Screenshot: https://screenshot.googleplex.com/FiSjzR3C4EZdDcJ

Bug: 1055150
Change-Id: I6d8aae51731ca7c5d22283088f689ef16cfc88b0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2588643Reviewed-by: Collin Baker <collinbaker@chromium.org>
Commit-Queue: Abigail Klein <abigailbklein@google.com>
Cr-Commit-Position: refs/heads/master@{#836745}