Revert of Set number of shards for telemetry_unittests to be 2

testing/buildbot/chromium.win.json

Index: testing/buildbot/chromium.win.json
diff --git a/testing/buildbot/chromium.win.json b/testing/buildbot/chromium.win.json
index 02b4a4a26ca89d8065bfc417857d3eb5fac451a4..756297028c7aab177e341bb38c27bcd68a552e5a 100644
--- a/testing/buildbot/chromium.win.json
+++ b/testing/buildbot/chromium.win.json
@@ -484,9 +484,7 @@
           "telemetry_unittests_run"
         ],
         "swarming": {
-          "can_use_on_swarming_builders": true,
-          "hard_timeout": 960,
-          "shards": 2
+          "can_use_on_swarming_builders": true
         }
       }
     ],
@@ -1428,9 +1426,7 @@
           "telemetry_unittests_run"
         ],
         "swarming": {
-          "can_use_on_swarming_builders": true,
-          "hard_timeout": 960,
-          "shards": 2
+          "can_use_on_swarming_builders": true
         }
       }
     ],
@@ -1820,9 +1816,7 @@
           "telemetry_unittests_run"
         ],
         "swarming": {
-          "can_use_on_swarming_builders": true,
-          "hard_timeout": 960,
-          "shards": 2
+          "can_use_on_swarming_builders": true
         }
       }
     ]