PDF: Use PDF metadata for the title instead of the last path element.

chrome/test/data/pdf/basic_plugin_test.js

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 var scriptingAPI;
 
 /**
  * These tests require that the PDF plugin be available to run correctly.
  */
 var tests = [
@@ skipping 37 matching lines @@
     }), 0);
   },
 
   function testGetSelectedText() {
     var client = new PDFScriptingAPI(window, window);
     client.selectAll();
     client.getSelectedText(chrome.test.callbackPass(function(selectedText) {
       chrome.test.assertEq('this is some text\nsome more text', selectedText);
     }));
   },
+
+  /**
+   * Test that the filename is used as the title.pdf.
+   */
+  function testHasCorrectTitle() {
+    chrome.test.assertEq('test.pdf', document.title);
+
+    chrome.test.succeed();
+  },
 ];
 
 var scriptingAPI = new PDFScriptingAPI(window, window);
 scriptingAPI.setLoadCallback(function() {
   chrome.test.runTests(tests);
 });