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When I changed how routes complete their futures, I broke the Dropdown button because it was still waiting for its own Completer to complete instead of using the Future returned by push. This patch fixes that issue. I've also removed the previous behavior of the DropdownButton forwarding its text style to its route. The mechansim that we were using doesn't work properly in all cases. For example, if the DropdownButton is a child of a LayoutBuilder, then the route will have already built by the time the DropdownButton gets a chance to forward its text style, causing an assert in setState. Finally, I've tweaked PopupMenuButton to work the same way as DropdownButton in a couple corner cases (e.g., not calling the changed callback if the button was removed from the tree before the menu completed its Future). Fixes #6352
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