Version: 49.0.2623.87
OS: Windows 10

In all windows in all profiles, the top chrome is not responding to mouse events correctly.

1. The profile button correctly turns blue on hover, but left- and right-clicking have no effect whatsoever. I cannot access the profile menu at all.
What is the expected output? What do you see instead?

2. Hovering over buttons in the top chrome doesn't change their view to the on-hover state; they remain normal. This includes bookmarks, navigation buttons, extension icons, and the 3-dot chrome menu button.

3. The bookmark star in the omnibox doesn't change on hover, but does turn filled-in once clicked. However, it cannot be clicked again to un-bookmark (stays filled in), and no menu or dialog is shown when clicking or right-clicking.

Other things respond normally to hover events, including: tab titles and their (x) close buttons; the omnibox, including badge and dropdown options.

Flags include --enable-extension-action-redesign and --top-chrome-md=material -- not sure what their defaults are today.