Remove serial test support from test-webkitpy.

Tools/Scripts/webkitpy/layout_tests/port/android_unittest.py

 # Copyright (C) 2012 Google Inc. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #    * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
 #    * Redistributions in binary form must reproduce the above
 # copyright notice, this list of conditions and the following disclaimer
@@ skipping 105 matching lines @@
         android.AndroidCommands._adb_command_path = None
         android.AndroidCommands._adb_command_path_options = ['adb']
 
     def make_executive(self, device_count):
         self._mock_executive = MockAndroidDebugBridge(device_count)
         return MockExecutive2(run_command_fn=self._mock_executive.run_command)
 
     def make_android_commands(self, device_count, serial):
         return android.AndroidCommands(self.make_executive(device_count), serial, debug_logging=False)
 
-    # The "adb" binary with the latest version should be used.
-    def serial_test_adb_command_path(self):
-        executive = self.make_executive(0)
-
-        android.AndroidCommands.set_adb_command_path_options(['path1', 'path2', 'path3'])
-        self.assertEqual('path2', android.AndroidCommands.adb_command_path(executive, debug_logging=False))
-
     # The used adb command should include the device's serial number, and get_serial() should reflect this.
     def test_adb_command_and_get_serial(self):
         android_commands = self.make_android_commands(1, '123456789ABCDEF0')
         self.assertEquals(['adb', '-s', '123456789ABCDEF0'], android_commands.adb_command())
         self.assertEquals('123456789ABCDEF0', android_commands.get_serial())
 
     # Running an adb command should return the command's output.
     def test_run_command(self):
         android_commands = self.make_android_commands(1, '123456789ABCDEF0')
 
@@ skipping 175 matching lines @@
     # Tests that valid tombstone listings will return the contents of the most recent file.
     def test_read_valid_tombstone_file(self):
         self._mock_adb.set_tombstone_output('-rw------- 1000 1000 3604 2013-11-19 16:15 tombstone_00\n' +
                                             '-rw------- 1000 1000 3604 2013-11-19 16:16 tombstone_10\n' +
                                             '-rw------- 1000 1000 3604 2013-11-19 16:15 tombstone_02')
         stacktrace = self._driver._get_last_stacktrace()
 
         self.assertEqual(0, len(self._warnings))
         self.assertEqual(0, len(self._errors))
         self.assertEqual(ChromiumAndroidDriverTombstoneTest.EXPECTED_STACKTRACE, stacktrace)