Gracefully support Navigator Gamepad methods in a detached state.

Source/modules/device_orientation/DeviceOrientationController.cpp

Index: Source/modules/device_orientation/DeviceOrientationController.cpp
diff --git a/Source/modules/device_orientation/DeviceOrientationController.cpp b/Source/modules/device_orientation/DeviceOrientationController.cpp
index ffbb996cbc40f799649feb99ad3af4b6d8c68582..779b3284abaf28bfd269ab369ff94aecaa97e0b4 100644
--- a/Source/modules/device_orientation/DeviceOrientationController.cpp
+++ b/Source/modules/device_orientation/DeviceOrientationController.cpp
@@ -37,8 +37,9 @@
 namespace WebCore {
 
 DeviceOrientationController::DeviceOrientationController(Document& document)
-    : DeviceSensorEventController(document)
+    : DeviceSensorEventController(document.page())
     , DOMWindowLifecycleObserver(document.domWindow())
+    , m_document(document)
 {
 }
 
@@ -100,6 +101,11 @@ bool DeviceOrientationController::isNullEvent(Event* event)
     return !orientationEvent->orientation()->canProvideEventData();
 }
 
+Document* DeviceOrientationController::document()
+{
+    return &m_document;
+}
+
 void DeviceOrientationController::didAddEventListener(DOMWindow* window, const AtomicString& eventType)
 {
     if (eventType != EventTypeNames::deviceorientation)