[test] Remove entry of renamed builder

The builder was renamed here:
https://chromium-review.googlesource.com/c/v8/v8/+/2418093

No-Try: true
Change-Id: I0b437cb854d56c903609109a21827b34b6dd4a94
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2418094
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69984}

infra/testing/builders.pyl

@@ -1153,37 +1153,6 @@
       {'name': 'v8testing', 'variant': 'slow_path', 'shards': 1},
     ],
   },
-  'V8 Linux64 TSAN - concurrent marking': {
-    'swarming_dimensions' : {
-      'os': 'Ubuntu-16.04',
-    },
-    'swarming_task_attrs': {
-      'expiration': 14400,
-      'hard_timeout': 3600,
-      'priority': 35,
-    },
-    'tests': [
-      {
-        'name': 'benchmarks',
-        'test_args': ['--extra-flags=--stress-incremental-marking'],
-      },
-      {
-        'name': 'mozilla',
-        'test_args': ['--extra-flags=--stress-incremental-marking'],
-      },
-      {
-        'name': 'test262',
-        'variant': 'default',
-        'test_args': ['--extra-flags=--stress-incremental-marking'],
-        'shards': 4,
-      },
-      {
-        'name': 'v8testing',
-        'test_args': ['--extra-flags=--stress-incremental-marking'],
-        'shards': 6,
-      },
-    ],
-  },
   'V8 Linux64 TSAN - stress-incremental-marking': {
     'swarming_dimensions' : {
       'os': 'Ubuntu-16.04',