Remove unused methods in webkitpy/layout_tests/.

third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/run_webkit_tests_unittest.py

Index: third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/run_webkit_tests_unittest.py
diff --git a/third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/run_webkit_tests_unittest.py b/third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/run_webkit_tests_unittest.py
index 9062ff4de36e89067815851db569602604c1bf3c..74e1deb849eddf5b8fc18156a085c7f36ec269d9 100644
--- a/third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/run_webkit_tests_unittest.py
+++ b/third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/run_webkit_tests_unittest.py
@@ -165,9 +165,6 @@ class StreamTestingMixin(object):
     def assertContains(self, stream, string):
         self.assertIn(string, stream.getvalue())
 
-    def assertEmpty(self, stream):
-        self.assertFalse(stream.getvalue())
-
     def assertNotEmpty(self, stream):
         self.assertTrue(stream.getvalue())
 
@@ -958,10 +955,6 @@ class RunTest(unittest.TestCase, StreamTestingMixin):
         self.assertTrue(passing_run(['--additional-expectations', '/tmp/overrides.txt', 'failures/unexpected/mismatch.html'],
                                     tests_included=True, host=host))
 
-    @staticmethod
-    def has_test_of_type(tests, type):
-        return [test for test in tests if type in test]
-
     def test_platform_directories_ignored_when_searching_for_tests(self):
         tests_run = get_tests_run(['--platform', 'test-mac-mac10.10'])
         self.assertNotIn('platform/test-mac-mac10.10/http/test.html', tests_run)