Revert of [Sync] Merge sync_unit_tests into components_unit_tests.

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 05e39bfae6134f9cdb5f42b3cc7ed83b2130b91d..e24c31878486a3affd92397adf51af8472632135 100644
--- a/testing/buildbot/chromium.mac.json
+++ b/testing/buildbot/chromium.mac.json
@@ -13,6 +13,7 @@
       "printing_unittests",
       "skia_unittests",
       "sql_unittests",
+      "sync_unit_tests",
       "ui_base_unittests",
       "unit_tests",
       "url_unittests"
@@ -294,6 +295,12 @@
         "swarming": {
           "can_use_on_swarming_builders": true
         },
+        "test": "sync_unit_tests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "ui_base_unittests"
       },
       {
@@ -627,6 +634,12 @@
         "swarming": {
           "can_use_on_swarming_builders": true
         },
+        "test": "sync_unit_tests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "ui_base_unittests"
       },
       {
@@ -961,6 +974,12 @@
         "swarming": {
           "can_use_on_swarming_builders": true
         },
+        "test": "sync_unit_tests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "ui_base_unittests"
       },
       {
@@ -1283,6 +1302,12 @@
         "swarming": {
           "can_use_on_swarming_builders": true
         },
+        "test": "sync_unit_tests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "ui_base_unittests"
       },
       {