Remove the "chromium" port name and --chromium platform option.

third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/port/android.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 411 matching lines @@
     PORT_HAS_AUDIO_CODECS_BUILT_IN = True
 
     BUILD_REQUIREMENTS_URL = 'https://www.chromium.org/developers/how-tos/android-build-instructions'
 
     def __init__(self, host, port_name, **kwargs):
         super(AndroidPort, self).__init__(host, port_name, **kwargs)
 
         self._operating_system = 'android'
         self._version = 'icecreamsandwich'
 
-        self._host_port = factory.PortFactory(host).get('chromium', **kwargs)
+        self._host_port = factory.PortFactory(host).get(**kwargs)
         self._server_process_constructor = self._android_server_process_constructor
 
         if not self.get_option('disable_breakpad'):
             self._dump_reader = DumpReaderAndroid(host, self._build_path())
 
         if self.driver_name() != self.CONTENT_SHELL_NAME:
             raise AssertionError('Layout tests on Android only support content_shell as the driver.')
 
         self._driver_details = ContentShellDriverDetails()
 
@@ skipping 882 matching lines @@
         return command
 
     def _read_prompt(self, deadline):
         last_char = ''
         while True:
             current_char = self._server_process.read_stdout(deadline, 1)
             if current_char == ' ':
                 if last_char in ('#', '$'):
                     return
             last_char = current_char