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For menus in chrome-in-mus, we attempt to create a Widget hosted in a native
window. For desktop builds, this means we attempt to host in a HWND or an
X11 window created by DesktopNativeWidgetAura. But for mus, we want to use
NativeWidgetMus. To do this, use the native-widget factory first if it's
available.

BUG=none

Review URL: https://codereview.chromium.org/1460003004

Cr-Commit-Position: refs/heads/master@{#361151}