Replacing custom bundling with webpack2.

src/pdf.worker.js

@@ -0,0 +1,30 @@
+/* Copyright 2012 Mozilla Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+/* eslint-disable no-unused-vars */
+/* umdutils ignore */
+
+'use strict';
+
+var pdfjsVersion = PDFJSDev.eval('BUNDLE_VERSION');
+var pdfjsBuild = PDFJSDev.eval('BUNDLE_BUILD');
+
+var pdfjsCoreWorker = require('./core/worker.js');
+
+if (typeof PDFJSDev === 'undefined' ||
+    !PDFJSDev.test('FIREFOX || MOZCENTRAL')) {
+  require('./core/network.js');
+}
+
+exports.WorkerMessageHandler = pdfjsCoreWorker.WorkerMessageHandler;