Fix is_manual_test for files with no file extension.

third_party/WebKit/Tools/Scripts/webkitpy/w3c/deps_updater_unittest.py

 # Copyright 2016 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.
 
 import unittest
 
 from webkitpy.w3c.deps_updater import DepsUpdater
 from webkitpy.common.host_mock import MockHost
 from webkitpy.common.system.filesystem_mock import MockFileSystem
 
@@ skipping 32 matching lines @@
             ])
         })
 
     def test_is_manual_test_regular_test(self):
         updater = DepsUpdater(MockHost())
         fs = MockFileSystem()
         dirname = '/mock-checkout/third_party/WebKit/LayoutTests/imported/wpt/a'
         self.assertFalse(updater.is_manual_test(fs, dirname, 'test.html'))
         self.assertFalse(updater.is_manual_test(fs, dirname, 'manual-foo.htm'))
         self.assertFalse(updater.is_manual_test(fs, dirname, 'script.js'))
+        self.assertFalse(updater.is_manual_test(fs, dirname, 'foo'))
 
     def test_is_manual_test_no_automation_file(self):
         updater = DepsUpdater(MockHost())
         fs = MockFileSystem()
         dirname = '/mock-checkout/third_party/WebKit/LayoutTests/imported/wpt/a'
         self.assertTrue(updater.is_manual_test(fs, dirname, 'test-manual.html'))
         self.assertTrue(updater.is_manual_test(fs, dirname, 'test-manual.htm'))
         self.assertTrue(updater.is_manual_test(fs, dirname, 'test-manual.xht'))
 
     def test_is_manual_test_with_corresponding_automation_file(self):
         updater = DepsUpdater(MockHost())
         imported_dir = '/mock-checkout/third_party/WebKit/LayoutTests/imported/'
         fs = MockFileSystem(files={
             imported_dir + 'wpt_automation/a/x-manual-input.js': '',
             imported_dir + 'wpt_automation/a/y-manual-automation.js': '',
         })
         self.assertTrue(updater.is_manual_test(fs, imported_dir + 'wpt/a', 'x-manual.html'))
         self.assertFalse(updater.is_manual_test(fs, imported_dir + 'wpt/a', 'y-manual.html'))