FXAAShader: Removed unused varying.

http://stackoverflow.com/questions/25415300/three-js-fxaa-giving-error-upon-update-from-r65-to-r68

examples/js/shaders/FXAAShader.js

@@ -19,11 +19,8 @@ THREE.FXAAShader = {
 
 	vertexShader: [
 
-		"varying vec2 vUv;",
-
 		"void main() {",
 
-			"vUv = uv;",
 			"gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );",
 
 		"}"
@@ -35,8 +32,6 @@ THREE.FXAAShader = {
 		"uniform sampler2D tDiffuse;",
 		"uniform vec2 resolution;",
 
-		"varying vec2 vUv;",
-
 		"#define FXAA_REDUCE_MIN   (1.0/128.0)",
 		"#define FXAA_REDUCE_MUL   (1.0/8.0)",
 		"#define FXAA_SPAN_MAX     8.0",