replaced use of overrideMimeType xhr request with xhr2 request

examples/js/loaders/ctm/CTMLoader.js

@@ -72,7 +72,6 @@ THREE.CTMLoader.prototype.loadParts = function( url, callback, parameters ) {
 	}
 
 	xhr.open( "GET", url, true );
-	if ( xhr.overrideMimeType && !( 'FormData' in window ) ) xhr.overrideMimeType( "text/plain; charset=x-user-defined" );
 	xhr.setRequestHeader( "Content-Type", "text/plain" );
 	xhr.send( null );
 
@@ -101,13 +100,7 @@ THREE.CTMLoader.prototype.load = function( url, callback, parameters ) {
 
 			if ( xhr.status === 200 || xhr.status === 0 ) {
 
-				var binaryData;
-
-				if( xhr.responseType === 'arraybuffer' )  {
-					binaryData = new Uint8Array(xhr.response);
-				} else {
-					binaryData  = xhr.responseText;
-				}
+				var binaryData = new Uint8Array(xhr.response);
 
 				var s = Date.now();
 
@@ -201,17 +194,7 @@ THREE.CTMLoader.prototype.load = function( url, callback, parameters ) {
 	}
 
 	xhr.open( "GET", url, true );
-
-	// check if xhr2 is available
-	if ( 'FormData' in window ) {
-
-		xhr.responseType = "arraybuffer";
-
-	} else if ( xhr.overrideMimeType )  {
-
-		xhr.overrideMimeType( "text/plain; charset=x-user-defined" );
-
-	}
+	xhr.responseType = "arraybuffer";
 
 	xhr.send( null );