Bug 1036233 - Initialize the data member of BluetoothDevice. r=btian

dom/bluetooth2/BluetoothDevice.cpp

@@ -74,6 +74,7 @@ private:
 BluetoothDevice::BluetoothDevice(nsPIDOMWindow* aWindow,
                                  const BluetoothValue& aValue)
   : DOMEventTargetHelper(aWindow)
+  , mPaired(false)
 {
   MOZ_ASSERT(aWindow);
   MOZ_ASSERT(IsDOMBinding());