Remove stray references to linux_ecs_ozone.

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

Index: masters/master.tryserver.chromium.linux/master.cfg
diff --git a/masters/master.tryserver.chromium.linux/master.cfg b/masters/master.tryserver.chromium.linux/master.cfg
index 01fba438b91099ec3939ef1ef1357abf75c0cb9f..f40a39de7b8b13361aedda50b40323083dfc35f3 100644
--- a/masters/master.tryserver.chromium.linux/master.cfg
+++ b/masters/master.tryserver.chromium.linux/master.cfg
@@ -229,14 +229,6 @@ chromium_builders.extend([{
   },
 ])
 
-# Ozone builder
-ozone_builders = [{
-    'name': 'linux_ecs_ozone',
-    'builddir': 'ozone-linux',
-    'factory': m_annotator.BaseFactory('ozone_ecs',
-        {'use_mirror': ActiveMaster.is_production_host or None}),
-}]
-
 b_linux_site_isolation = {
   'name': 'linux_site_isolation',
   'factory': m_annotator.BaseFactory('chromium_trybot'),
@@ -409,7 +401,7 @@ c['builders'] = [
   b_linux_nacl_sdk,
   b_linux_nacl_sdk_build,
   b_linux_site_isolation,
-] + chromium_builders + ozone_builders + variable_builders
+] + chromium_builders + variable_builders
 
 
 # Slaves are loaded from slaves.cfg.