Removed window dependencies. See #478.

examples/js/renderers/WebGLRenderer3.js

@@ -27,8 +27,8 @@ THREE.WebGLRenderer3 = function ( parameters ) {
 
 	var devicePixelRatio = parameters.devicePixelRatio !== undefined
 				? parameters.devicePixelRatio
-				: window.devicePixelRatio !== undefined
-					? window.devicePixelRatio
+				: self.devicePixelRatio !== undefined
+					? self.devicePixelRatio
 					: 1;
 
 	var gl;

src/renderers/CanvasRenderer.js

@@ -117,8 +117,8 @@ THREE.CanvasRenderer = function ( parameters ) {
 
 	this.devicePixelRatio = parameters.devicePixelRatio !== undefined
 				? parameters.devicePixelRatio
-				: window.devicePixelRatio !== undefined
-					? window.devicePixelRatio
+				: self.devicePixelRatio !== undefined
+					? self.devicePixelRatio
 					: 1;
 
 	this.autoClear = true;

src/renderers/WebGLRenderer.js

@@ -44,8 +44,8 @@ THREE.WebGLRenderer = function ( parameters ) {
 	this.context = null;
 	this.devicePixelRatio = parameters.devicePixelRatio !== undefined
 				? parameters.devicePixelRatio
-				: window.devicePixelRatio !== undefined
-					? window.devicePixelRatio
+				: self.devicePixelRatio !== undefined
+					? self.devicePixelRatio
 					: 1;
 
 	// clearing