Fix finger print, remove unused code

src/worker.js

@@ -91,7 +91,7 @@ var WorkerMessageHandler = {
       pdfModel = new PDFDocument(new Stream(data));
       var doc = {
         numPages: pdfModel.numPages,
-        fingerprint: pdfModel.fingerprint,
+        fingerprint: pdfModel.getFingerprint(),
         destinations: pdfModel.catalog.destinations,
         outline: pdfModel.catalog.documentOutline,
         info: pdfModel.info,

web/viewer.js

@@ -860,7 +860,6 @@ var PageView = function pageView(container, pdfPage, id, scale,
   }
 
   this.getPagePoint = function pageViewGetPagePoint(x, y) {
-    var scale = PDFView.currentScale;
     return this.viewport.convertToPdfPoint(x, y);
   };