Remove unused function.

static/upload.js

-
 var uploadStatusDiv = document.getElementById("uploadStatusDiv");
 var uploadText = document.getElementById("uploadText");
 var uploadButton = document.getElementById("uploadButton");
@@ -44,12 +43,6 @@ function uploadFile() {
     uploadFileInput.disabled = true;
 }
 
-function replacePage(content) {
-    document.open('text/html');
-    document.write(content);
-    document.close();
-}
-
 function progressHandler(event) {
     var percent = (event.loaded / event.total) * 100;