rename

Runtime/editor/editor_utils.cs

             this._lastDevicePixelRatio = GameViewUtil.getGameViewDevicePixelRatio();
         }
         
-        public float DevicePixelRatio {
+        public float devicePixelRatio {
             get { return this._lastDevicePixelRatio; }
         }
     }

Runtime/engine/DisplayMetrics.cs

         void OnGUI();
         void Update();
 
-        float DevicePixelRatio { get; } 
+        float devicePixelRatio { get; } 
     }
 
     public class PlayerDisplayMetrics: DisplayMetrics {
         }
 
 
-        public float DevicePixelRatio {
+        public float devicePixelRatio {
             get {
                 if (this._devicePixelRatio > 0) {
                     return this._devicePixelRatio;

Runtime/engine/UIWidgetsPanel.cs

             get {
                 return this.devicePixelRatioOverride > 0
                     ? this.devicePixelRatioOverride
-                    : this._displayMetrics.DevicePixelRatio;
+                    : this._displayMetrics.devicePixelRatio;
             }
         }