Remove support for the linux-precise layout tests port.

third_party/WebKit/Tools/Scripts/webkitpy/common/system/platforminfo.py

 # Copyright (c) 2011 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 135 matching lines @@
         raise AssertionError('unrecognized platform string "%s"' % sys_platform)
 
     def _determine_mac_version(self, mac_version_string):
         minor_release = int(mac_version_string.split('.')[1])
         # FIXME: This should really be >= 9, and we should get rid of 'future'.
         assert minor_release >= 6, 'Unsupported mac os version: %s' % mac_version_string
         if minor_release in (9, 10, 11):
             return 'mac10.%d' % minor_release
         return 'future'
 
-    def _determine_linux_version(self, platform_module):
-        # Default to trusty if version is not recognized, this supports third party integrations.
-        version = platform_module.linux_distribution()[2]
-        officially_supported_versions = ['precise', 'trusty']
-        return 'trusty' if version not in officially_supported_versions else version
+    def _determine_linux_version(self, _):
+        return 'trusty'
 
     def _determine_win_version(self, win_version_tuple):
         if win_version_tuple[:2] == (10, 0):
             return '10'
         if win_version_tuple[:2] == (6, 3):
             return '8.1'
         if win_version_tuple[:2] == (6, 2):
             return '8'
         if win_version_tuple[:3] == (6, 1, 7601):
             return '7sp1'
@@ skipping 12 matching lines @@
         if hasattr(sys_module, 'getwindowsversion'):
             return sys_module.getwindowsversion()
         return self._win_version_tuple_from_cmd()
 
     def _win_version_tuple_from_cmd(self):
         # Note that this should only ever be called on windows, so this should always work.
         ver_output = self._executive.run_command(['cmd', '/c', 'ver'], decode_output=False)
         match_object = re.search(r'(?P<major>\d+)\.(?P<minor>\d)\.(?P<build>\d+)', ver_output)
         assert match_object, 'cmd returned an unexpected version string: ' + ver_output
         return tuple(map(int, match_object.groups()))