Gracefully support Navigator Gamepad methods in a detached state.

Source/modules/device_orientation/DeviceMotionController.cpp

Index: Source/modules/device_orientation/DeviceMotionController.cpp
diff --git a/Source/modules/device_orientation/DeviceMotionController.cpp b/Source/modules/device_orientation/DeviceMotionController.cpp
index d36e1983f4f4121ac381586f821816928f26cf82..e1158cdbcb8bc8faf03cfeecceb7131e2080c099 100644
--- a/Source/modules/device_orientation/DeviceMotionController.cpp
+++ b/Source/modules/device_orientation/DeviceMotionController.cpp
@@ -37,7 +37,7 @@
 namespace WebCore {
 
 DeviceMotionController::DeviceMotionController(Document& document)
-    : DeviceSensorEventController(document)
+    : DeviceSensorEventController(&document)
     , DOMWindowLifecycleObserver(document.domWindow())
 {
 }