Removed devicePixelRatio check in renderers. Fixes #4591.

src/renderers/CanvasRenderer.js

@@ -125,7 +125,7 @@ THREE.CanvasRenderer = function ( parameters ) {
 		_canvasWidthHalf = Math.floor( _canvasWidth / 2 );
 		_canvasHeightHalf = Math.floor( _canvasHeight / 2 );
 
-		if ( this.devicePixelRatio !== 1 && updateStyle !== false ) {
+		if ( updateStyle !== false ) {
 
 			_canvas.style.width = width + 'px';
 			_canvas.style.height = height + 'px';

src/renderers/WebGLRenderer.js

@@ -303,7 +303,7 @@ THREE.WebGLRenderer = function ( parameters ) {
 		_canvas.width = width * this.devicePixelRatio;
 		_canvas.height = height * this.devicePixelRatio;
 
-		if ( this.devicePixelRatio !== 1 && updateStyle !== false ) {
+		if ( updateStyle !== false ) {
 
 			_canvas.style.width = width + 'px';
 			_canvas.style.height = height + 'px';