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

chrome/test/data/pdf/basic_plugin_test.js

Index: chrome/test/data/pdf/basic_plugin_test.js
diff --git a/chrome/test/data/pdf/basic_plugin_test.js b/chrome/test/data/pdf/basic_plugin_test.js
index fc73d5417b4ca607e92ee746eddc13317f124178..dbcf0bc31e4ed4864dd5f755c73af428e310c228 100644
--- a/chrome/test/data/pdf/basic_plugin_test.js
+++ b/chrome/test/data/pdf/basic_plugin_test.js
@@ -55,6 +55,15 @@ var tests = [
       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);