Bug 1545180 - Correct DualShock 4 mapping type. r=qdot

Differential Revision: https://phabricator.services.mozilla.com/D27945

--HG--
extra : moz-landing-system : lando

Author: daoshengmu

dom/gamepad/GamepadRemapping.cpp

@@ -100,6 +100,10 @@ class DefaultRemapper final : public GamepadRemapper {
     numButtons = aButtonCount;
   }
 
+  virtual GamepadMappingType GetMappingType() const override {
+    return GamepadMappingType::_empty;
+  }
+
   virtual void RemapAxisMoveEvent(uint32_t aIndex, uint32_t aAxis,
                                   double aValue) const override {
     RefPtr<GamepadPlatformService> service =
@@ -362,10 +366,6 @@ class Dualshock4Remapper final : public GamepadRemapper {
     return DUALSHOCK_BUTTON_COUNT;
   }
 
-  virtual GamepadMappingType GetMappingType() const override {
-    return GamepadMappingType::_empty;
-  }
-
   virtual void RemapAxisMoveEvent(uint32_t aIndex, uint32_t aAxis,
                                   double aValue) const override {
     RefPtr<GamepadPlatformService> service =