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The ui_controls_aura implementations either dispatch events via
aura::Window::GetHost() (which first does GetRootWindow()), find the
root window independently, or else ignore the window argument. So the
GetRootWindow call is not required here.

BUG=399191

Review URL: https://codereview.chromium.org/442633003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@287708 0039d316-1c4b-4281-b951-d872f2087c98