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