WebKit & WebCore part of the device motion implementation using the platform layer.

Source/WebCore/page/DOMWindow.cpp

Index: Source/WebCore/page/DOMWindow.cpp
diff --git a/Source/WebCore/page/DOMWindow.cpp b/Source/WebCore/page/DOMWindow.cpp
index 75bd58521d638c1595697025c5e12873cf8e29c6..475dabff48ed734ed75a5bf88e46a1636c9eff61 100644
--- a/Source/WebCore/page/DOMWindow.cpp
+++ b/Source/WebCore/page/DOMWindow.cpp
@@ -1622,8 +1622,7 @@ bool DOMWindow::addEventListener(const AtomicString& eventType, PassRefPtr<Event
         addBeforeUnloadEventListener(this);
 #if ENABLE(DEVICE_ORIENTATION)
     else if (eventType == eventNames().devicemotionEvent && RuntimeEnabledFeatures::deviceMotionEnabled()) {
-        if (DeviceMotionController* controller = DeviceMotionController::from(page()))
-            controller->addDeviceEventListener(this);
+        DeviceMotionController::shared().addDeviceEventListener(this);
     } else if (eventType == eventNames().deviceorientationEvent && RuntimeEnabledFeatures::deviceOrientationEnabled()) {
         if (DeviceOrientationController* controller = DeviceOrientationController::from(page()))
             controller->addDeviceEventListener(this);
@@ -1658,8 +1657,7 @@ bool DOMWindow::removeEventListener(const AtomicString& eventType, EventListener
         removeBeforeUnloadEventListener(this);
 #if ENABLE(DEVICE_ORIENTATION)
     else if (eventType == eventNames().devicemotionEvent) {
-        if (DeviceMotionController* controller = DeviceMotionController::from(page()))
-            controller->removeDeviceEventListener(this);
+        DeviceMotionController::shared().removeDeviceEventListener(this);
     } else if (eventType == eventNames().deviceorientationEvent) {
         if (DeviceOrientationController* controller = DeviceOrientationController::from(page()))
             controller->removeDeviceEventListener(this);
@@ -1723,8 +1721,7 @@ void DOMWindow::removeAllEventListeners()
     EventTarget::removeAllEventListeners();
 
 #if ENABLE(DEVICE_ORIENTATION)
-    if (DeviceMotionController* controller = DeviceMotionController::from(page()))
-        controller->removeAllDeviceEventListeners(this);
+    DeviceMotionController::shared().removeAllDeviceEventListeners(this);
     if (DeviceOrientationController* controller = DeviceOrientationController::from(page()))
         controller->removeAllDeviceEventListeners(this);
 #endif