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Only show status bar blocker view if nav bar is translucent.
It's the background drawable of the translucent nav bar that makes the blocker view necessary (as the background creates a visual 'gap' between status bar and visual start of the nav bar), so if the nav bar isn't translucent, there's no need for the view. Change-Id: I684c8d24abe3d4393ae7db88fe5023aa65836164