Clean up.

src/Three.js

@@ -331,12 +331,6 @@ THREE.RGBM7Encoding = 3004;
 THREE.RGBM16Encoding = 3005;
 THREE.RGBDEncoding = 3006; // MaxRange is 256.
 
-// Depth format
-
-THREE.AutoDepthFormat = 3100;  // switches based on camera type, uses gl_FragCoord.z
-THREE.LinearClipZDepthFormat = 3101;	// used by orthographic cameras
-THREE.InvClipZDepthFormat = 3102;  // used by perspective cameras
-
 // Depth packing strategies
 
 THREE.LinearDepthPacking = 3200;  // for writing to float textures for high precision or for visualizing results in RGB buffers