Remove unused variables

These have been found using `gulp lint` in combination with the `unused:
true` parameter for JSHint. Unfortunately there are too many false
positives to enable this feature, but now that most globals have been
removed because of the conversion to UMD the results are much more
useful than before.

web/app.js

@@ -857,7 +857,6 @@ var PDFViewerApplication = {
     pdfViewer.setDocument(pdfDocument);
     var firstPagePromise = pdfViewer.firstPagePromise;
     var pagesPromise = pdfViewer.pagesPromise;
-    var onePageRendered = pdfViewer.onePageRendered;
 
     this.pageRotation = 0;
 

web/pdf_find_controller.js

@@ -24,7 +24,7 @@
   } else {
     factory((root.pdfjsWebPDFFindController = {}), root.pdfjsWebUIUtils);
   }
-}(this, function (exports, uiUtils, firefoxCom) {
+}(this, function (exports, uiUtils) {
 
 var scrollIntoView = uiUtils.scrollIntoView;
 
@@ -322,10 +322,9 @@ var PDFFindController = (function PDFFindControllerClosure() {
      * @param {number} index - match index.
      * @param {Array} elements - text layer div elements array.
      * @param {number} beginIdx - start index of the div array for the match.
-     * @param {number} endIdx - end index of the div array for the match.
      */
     updateMatchPosition: function PDFFindController_updateMatchPosition(
-        pageIndex, index, elements, beginIdx, endIdx) {
+        pageIndex, index, elements, beginIdx) {
       if (this.selected.matchIdx === index &&
           this.selected.pageIdx === pageIndex) {
         var spot = {

web/pdf_page_view.js

@@ -187,7 +187,6 @@ var PDFPageView = (function PDFPageViewClosure() {
       var isScalingRestricted = false;
       if (this.canvas && pdfjsLib.PDFJS.maxCanvasPixels > 0) {
         var outputScale = this.outputScale;
-        var pixelsInViewport = this.viewport.width * this.viewport.height;
         if (((Math.floor(this.viewport.width) * outputScale.sx) | 0) *
             ((Math.floor(this.viewport.height) * outputScale.sy) | 0) >
             pdfjsLib.PDFJS.maxCanvasPixels) {

web/text_layer_builder.js

@@ -225,7 +225,7 @@ var TextLayerBuilder = (function TextLayerBuilderClosure() {
 
         if (this.findController) {
           this.findController.updateMatchPosition(pageIdx, i, textDivs,
-                                                  begin.divIdx, end.divIdx);
+                                                  begin.divIdx);
         }
 
         // Match inside new div.