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The crash happens if when the HWND is destroyed someone asks if a
child NativeWidgetAura is Active. In particular during this code path
we've gone through ~RootWindow and are in ~Window. When this happens
GetRootWindow() uses Window's implementation, which returns NULL and
we crash.

BUG=264855
TEST=none
R=ben@chromium.org

Review URL: https://chromiumcodereview.appspot.com/23904005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@222096 0039d316-1c4b-4281-b951-d872f2087c98