Remove use of wdiff from layout test runner.

third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/port/port_testcase.py

Index: third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/port/port_testcase.py
diff --git a/third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/port/port_testcase.py b/third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/port/port_testcase.py
index 9f1d5b00cd11e880823ae1a0632832bf68d7fe01..ac24108a7c50c9e41f8a26da28590a873e2f5c47 100644
--- a/third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/port/port_testcase.py
+++ b/third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/port/port_testcase.py
@@ -70,9 +70,6 @@ class PortTestCase(unittest.TestCase):
         port_name = self.port_maker.determine_full_port_name(host, options, port_name)
         return self.port_maker(host, port_name, options=options, **kwargs)
 
-    def make_wdiff_available(self, port):
-        port._wdiff_available = True
-
     def test_check_build(self):
         port = self.make_port()
         port._check_file_exists = lambda path, desc: True
@@ -215,24 +212,6 @@ class PortTestCase(unittest.TestCase):
         self.assertEqual(port.diff_image("EXPECTED", "ACTUAL"),
                          (None, 'Image diff returned an exit code of 2. See http://crbug.com/278596'))
 
-    def test_check_wdiff(self):
-        port = self.make_port()
-        port.check_wdiff()
-
-    def test_wdiff_text_fails(self):
-        host = MockSystemHost(os_name=self.os_name, os_version=self.os_version)
-        host.executive = MockExecutive(should_throw=True)  # pylint: disable=protected-access
-        port = self.make_port(host=host)
-        port._executive = host.executive  # AndroidPortTest.make_port sets its own executive, so reset that as well.
-
-        # This should raise a ScriptError that gets caught and turned into the
-        # error text, and also mark wdiff as not available.
-        self.make_wdiff_available(port)
-        self.assertTrue(port.wdiff_available())
-        diff_txt = port.wdiff_text("/tmp/foo.html", "/tmp/bar.html")
-        self.assertEqual(diff_txt, port._wdiff_error_html)
-        self.assertFalse(port.wdiff_available())
-
     def test_test_configuration(self):
         port = self.make_port()
         self.assertTrue(port.test_configuration())