Urlbar improvements

• Use the > separator for current branch
• Squeeze the height a bit more. We want the Urlbar as little space as possible. It adjusts itself when tab bar is hidden or otherwise
• Kill the hover feedback for separators. They don't do anything so don't highlight them when the cursor is over them

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If this is the route we take, in a follow-up the ViewBarContainer class should be killed as it has no purpose now.

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