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

chrome/test/data/pdf/title_test.js

Index: chrome/test/data/pdf/title_test.js
diff --git a/chrome/test/data/pdf/title_test.js b/chrome/test/data/pdf/title_test.js
new file mode 100644
index 0000000000000000000000000000000000000000..d4262bed97b817441a94f34aad3a165ba5164407
--- /dev/null
+++ b/chrome/test/data/pdf/title_test.js
@@ -0,0 +1,19 @@
+// Copyright 2015 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 tests = [
+  /**
+   * Test that the correct title is displayed for test-title.pdf.
+   */
+  function testHasCorrectTitle() {
+    chrome.test.assertEq('PDF title test', document.title);
+
+    chrome.test.succeed();
+  }
+];
+
+var scriptingAPI = new PDFScriptingAPI(window, window);
+scriptingAPI.setLoadCallback(function() {
+  chrome.test.runTests(tests);
+});