Enable the object-shorthand ESLint rule in web

Please see http://eslint.org/docs/rules/object-shorthand.

For the most part, these changes are of the search-and-replace kind, and the previously enabled `no-undef` rule should complement the tests in helping ensure that no stupid errors crept into to the patch.

web/text_layer_builder.js

@@ -91,7 +91,7 @@ var TextLayerBuilder = (function TextLayerBuilderClosure() {
         container: textLayerFrag,
         viewport: this.viewport,
         textDivs: this.textDivs,
-        timeout: timeout,
+        timeout,
         enhanceTextSelection: this.enhanceTextSelection,
       });
       this.textLayerRenderTask.promise.then(function () {
@@ -397,13 +397,13 @@ DefaultTextLayerFactory.prototype = {
    * @param {boolean} enhanceTextSelection
    * @returns {TextLayerBuilder}
    */
-  createTextLayerBuilder: function (textLayerDiv, pageIndex, viewport,
-                                    enhanceTextSelection) {
+  createTextLayerBuilder(textLayerDiv, pageIndex, viewport,
+                         enhanceTextSelection = false) {
     return new TextLayerBuilder({
-      textLayerDiv: textLayerDiv,
-      pageIndex: pageIndex,
-      viewport: viewport,
-      enhanceTextSelection: enhanceTextSelection
+      textLayerDiv,
+      pageIndex,
+      viewport,
+      enhanceTextSelection,
     });
   }
 };