Delete chromium valgrind bots.

scripts/slave/recipe_modules/chromium_tests/trybots.py

Index: scripts/slave/recipe_modules/chromium_tests/trybots.py
diff --git a/scripts/slave/recipe_modules/chromium_tests/trybots.py b/scripts/slave/recipe_modules/chromium_tests/trybots.py
index b80eeb3eff7ceb944140f271650078bff547648e..207e893b9d0ccdd3e21cc372d7940fa90b82a28d 100644
--- a/scripts/slave/recipe_modules/chromium_tests/trybots.py
+++ b/scripts/slave/recipe_modules/chromium_tests/trybots.py
@@ -378,35 +378,6 @@ TRYBOTS = freeze({
           },
         ],
       },
-      'linux_valgrind': {
-        'bot_ids': [
-          {
-            'mastername': 'chromium.memory.fyi',
-            'buildername': 'Chromium Linux Builder (valgrind)',
-            'tester': 'Linux Tests (valgrind)(1)',
-          },
-          {
-            'mastername': 'chromium.memory.fyi',
-            'buildername': 'Chromium Linux Builder (valgrind)',
-            'tester': 'Linux Tests (valgrind)(2)',
-          },
-          {
-            'mastername': 'chromium.memory.fyi',
-            'buildername': 'Chromium Linux Builder (valgrind)',
-            'tester': 'Linux Tests (valgrind)(3)',
-          },
-          {
-            'mastername': 'chromium.memory.fyi',
-            'buildername': 'Chromium Linux Builder (valgrind)',
-            'tester': 'Linux Tests (valgrind)(4)',
-          },
-          {
-            'mastername': 'chromium.memory.fyi',
-            'buildername': 'Chromium Linux Builder (valgrind)',
-            'tester': 'Linux Tests (valgrind)(5)',
-          },
-        ],
-      },
     },
   },
   'tryserver.chromium.mac': {