Update from https://crrev.com/316786

testing/buildbot/chromium.mac.json

Index: testing/buildbot/chromium.mac.json
diff --git a/testing/buildbot/chromium.mac.json b/testing/buildbot/chromium.mac.json
index 55e54813ec5d60d5c4bddac5455a3c7feccf8dac..d7f39bb17a9504e6ef11a3e0eea914579309d43c 100644
--- a/testing/buildbot/chromium.mac.json
+++ b/testing/buildbot/chromium.mac.json
@@ -59,7 +59,12 @@
           "can_use_on_swarming_builders": true
         }
       },
-      "crypto_unittests",
+      {
+        "test": "crypto_unittests",
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        }
+      },
       "extensions_unittests",
       "gcm_unit_tests",
       {
@@ -204,7 +209,12 @@
           "can_use_on_swarming_builders": true
         }
       },
-      "crypto_unittests",
+      {
+        "test": "crypto_unittests",
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        }
+      },
       "extensions_unittests",
       "gcm_unit_tests",
       {
@@ -349,7 +359,12 @@
           "can_use_on_swarming_builders": true
         }
       },
-      "crypto_unittests",
+      {
+        "test": "crypto_unittests",
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        }
+      },
       "extensions_unittests",
       "gcm_unit_tests",
       {
@@ -494,7 +509,12 @@
           "can_use_on_swarming_builders": true
         }
       },
-      "crypto_unittests",
+      {
+        "test": "crypto_unittests",
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        }
+      },
       "extensions_unittests",
       "gcm_unit_tests",
       {