Bug 1022417: Annotate BluetoothHfpManager::GetVolumeTask as MOZ_FINAL to calm GCC Wdelete-non-virtual-dtor build warning. blanket-r=ehsan

dom/bluetooth/bluez/BluetoothHfpManager.cpp

@@ -164,7 +164,7 @@ static CINDItem sCINDItems[] = {
 #endif
 };
 
-class BluetoothHfpManager::GetVolumeTask : public nsISettingsServiceCallback
+class BluetoothHfpManager::GetVolumeTask MOZ_FINAL : public nsISettingsServiceCallback
 {
 public:
   NS_DECL_ISUPPORTS