Remove stray references to linux_ecs_ozone.

masters/master.tryserver.chromium.linux/slaves.cfg

 # -*- python -*-
 # ex: set syntax=python:
 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # See master.experimental/slaves.cfg for documentation.
 
 def linux():
   chromeos_boards = ('x86-generic', 'amd64-generic', 'daisy')
@@ skipping 46 matching lines @@
     'linux_chromium_msan_rel_ng',
     'linux_chromium_tsan_rel_ng',
     'linux_chromium_practice_rel_ng',
     'linux_chromium_variable',
     'linux_chromium_variable_chrome',
     'linux_chromium_variable_clobber',
     'linux_chromium_webkit_asan_variable',
     'linux_chromium_webkit_leak_variable',
     'linux_chromium_webkit_msan_variable',
     'linux_chromium_webkit_variable',
-    'linux_ecs_ozone',
     'linux_nacl_sdk',
     'linux_nacl_sdk_build',
     'linux_optional_gpu_tests_rel',
     'linux_site_isolation',
   ]
 
   optional_32_slaves = [897]
   optional_32_builders = [
     'linux_chromium_variable_32',
     'linux_chromium_variable_32_chrome',
@@ skipping 94 matching lines @@
       'builder': ['linux_chromium_browser_side_navigation_rel'],
       'hostname': 'slave914-c4',
       'pool': 'linux_chromium_browser_side_navigation_rel',
     }
   ])
 
   return result
 
 
 slaves = linux()