Remove support for the linux-precise layout tests port.

third_party/WebKit/Tools/Scripts/webkitpy/common/system/platforminfo_unittest.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 128 matching lines @@
         self.assertRaises(AssertionError, self.make_info, fake_sys('vms'))
 
     def test_os_version(self):
         self.assertRaises(AssertionError, self.make_info, fake_sys('darwin'), fake_platform('10.4.3'))
         self.assertEqual(self.make_info(fake_sys('darwin'), fake_platform('10.9.0')).os_version, 'mac10.9')
         self.assertEqual(self.make_info(fake_sys('darwin'), fake_platform('10.10.0')).os_version, 'mac10.10')
         self.assertEqual(self.make_info(fake_sys('darwin'), fake_platform('10.11.0')).os_version, 'mac10.11')
         self.assertEqual(self.make_info(fake_sys('darwin'), fake_platform('10.12.0')).os_version, 'future')
 
         self.assertEqual(self.make_info(fake_sys('linux2')).os_version, 'trusty')
-        info = self.make_info(fake_sys('linux2'), fake_platform(linux_version='precise'))
-        self.assertEqual(info.os_version, 'precise')
         info = self.make_info(fake_sys('linux2'), fake_platform(linux_version='utopic'))
         self.assertEqual(info.os_version, 'trusty')
 
         self.assertEqual(self.make_info(fake_sys('freebsd8'), fake_platform('', '8.3-PRERELEASE')).os_version, '8.3-PRERELEASE')
         self.assertEqual(self.make_info(fake_sys('freebsd9'), fake_platform('', '9.0-RELEASE')).os_version, '9.0-RELEASE')
 
         self.assertRaises(AssertionError, self.make_info, fake_sys('win32', tuple([5, 0, 1234])))
         self.assertRaises(AssertionError, self.make_info, fake_sys('win32', tuple([6, 1, 1234])))
         self.assertEqual(self.make_info(fake_sys('win32', tuple([10, 1, 1234]))).os_version, 'future')
         self.assertEqual(self.make_info(fake_sys('win32', tuple([10, 0, 1234]))).os_version, '10')
@@ skipping 48 matching lines @@
         self.assertEqual(info.total_bytes_memory(), 1234)
 
         info = self.make_info(fake_sys('win32', tuple([6, 1, 7600])))
         self.assertIsNone(info.total_bytes_memory())
 
         info = self.make_info(fake_sys('linux2'))
         self.assertIsNone(info.total_bytes_memory())
 
         info = self.make_info(fake_sys('freebsd9'))
         self.assertIsNone(info.total_bytes_memory())