textLayer is not used anymore in render context.

It should be removed to prevent confusion when reading the code.

test/driver.js

@@ -311,7 +311,6 @@ function nextPage(task, loadError) {
         }
         var renderContext = {
           canvasContext: drawContext,
-          textLayer: textLayerBuilder,
           viewport: viewport
         };
         var completeRender = (function(error) {

web/page_view.js

@@ -644,7 +644,6 @@ var PageView = function pageView(container, id, scale,
     var renderContext = {
       canvasContext: ctx,
       viewport: this.viewport,
-      textLayer: textLayer,
       // intent: 'default', // === 'display'
       continueCallback: function pdfViewcContinueCallback(cont) {
         if (PDFView.highestPriorityPage !== 'page' + self.id) {