Bug 737462 - nsDeviceMotion leaks hal observers. r=mwu

dom/system/nsDeviceMotion.cpp

@@ -140,6 +140,9 @@ nsDeviceMotion::nsDeviceMotion()
 
 nsDeviceMotion::~nsDeviceMotion()
 {
+  if (mStarted)
+    Shutdown();
+
   if (mTimeoutTimer)
     mTimeoutTimer->Cancel();
 }

hal/Hal.cpp

@@ -447,6 +447,8 @@ UnregisterSensorObserver(SensorType aSensor, ISensorObserver *aObserver) {
   observers.RemoveObserver(aObserver);
   if(observers.Length() == 0) {
     DisableSensorNotifications(aSensor);
+    delete [] gSensorObservers;
+    gSensorObservers = nsnull;
   }
 }