Use only one tester for debug Linux since we're swarming the tests now.

masters/master.chromium.linux/master_linux_cfg.py

 # Copyright (c) 2012 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.
 
 from buildbot.scheduler import Triggerable
 from buildbot.schedulers.basic import SingleBranchScheduler
 
 from master.factory import annotator_factory
 
 m_annotator = annotator_factory.AnnotatorFactory()
@@ skipping 11 matching lines @@
           'Linux GN (dbg)',
       ]),
       Triggerable(name='linux_rel_trigger', builderNames=[
           'Linux Tests',
       ]),
       Triggerable(name='linux_dbg_32_trigger', builderNames=[
           'Linux Tests (dbg)(1)(32)',
           'Linux Tests (dbg)(2)(32)',
       ]),
       Triggerable(name='linux_dbg_trigger', builderNames=[
-          'Linux Tests (dbg)(1)',
-          'Linux Tests (dbg)(2)',
+          'Linux Tests (dbg)',
       ]),
   ])
   specs = [
     {
       'name': 'Linux Builder',
       'triggers': ['linux_rel_trigger'],
     },
     {'name': 'Linux Tests'},
     {'name': 'Linux Builder (dbg)(32)', 'triggers': ['linux_dbg_32_trigger']},
     {'name': 'Linux Tests (dbg)(1)(32)'},
     {'name': 'Linux Tests (dbg)(2)(32)'},
     {'name': 'Linux Builder (dbg)', 'triggers': ['linux_dbg_trigger']},
-    {'name': 'Linux Tests (dbg)(1)'},
-    {'name': 'Linux Tests (dbg)(2)'},
+    {'name': 'Linux Tests (dbg)'},
     {'name': 'Linux GN', 'recipe': 'chromium_gn'},
     {'name': 'Linux GN (dbg)', 'recipe': 'chromium_gn'},
   ]
 
   c['builders'].extend([
       {
         'name': spec['name'],
         'factory': m_annotator.BaseFactory(
             spec.get('recipe', 'chromium'),
             factory_properties=spec.get('factory_properties'),
             triggers=spec.get('triggers')),
         'notify_on_missing': True,
         'category': '4linux',
       } for spec in specs
   ])