Blink: make the dispatchDeviceEvent virtual to allow overrides in subclasses.

Source/core/frame/DeviceSensorEventController.h

Index: Source/core/frame/DeviceSensorEventController.h
diff --git a/Source/core/frame/DeviceSensorEventController.h b/Source/core/frame/DeviceSensorEventController.h
index 085f1e2a1c71b79e0d7aa6e248347f329eec47e9..913b46f4b9fdd7b8886e21ecc2278bd569b79dbd 100644
--- a/Source/core/frame/DeviceSensorEventController.h
+++ b/Source/core/frame/DeviceSensorEventController.h
@@ -44,7 +44,8 @@ protected:
     explicit DeviceSensorEventController(Document&);
     virtual ~DeviceSensorEventController();
 
-    void dispatchDeviceEvent(const PassRefPtrWillBeRawPtr<Event>);
+    // Default dispatch is on DOMWindow, override in deriving class if necessary.
+    virtual void dispatchDeviceEvent(const PassRefPtrWillBeRawPtr<Event>);
 
     virtual bool hasLastData() = 0;
     virtual PassRefPtrWillBeRawPtr<Event> getLastEvent() = 0;