Revert of [Sync] Merge sync_unit_tests into components_unit_tests.

testing/buildbot/chromium.memory.json

Index: testing/buildbot/chromium.memory.json
diff --git a/testing/buildbot/chromium.memory.json b/testing/buildbot/chromium.memory.json
index d16b5f9ad96e71508802597c228c7fbb8d0c4c75..72540d8b60cc5ae453de359d8a0ea500e3b77171 100644
--- a/testing/buildbot/chromium.memory.json
+++ b/testing/buildbot/chromium.memory.json
@@ -213,6 +213,12 @@
           "can_use_on_swarming_builders": true
         },
         "test": "sql_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "sync_unit_tests"
       },
       {
         "swarming": {
@@ -504,6 +510,12 @@
         "test": "sql_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "sync_unit_tests"
+      },
+      {
         "test": "ui_arc_unittests"
       },
       {
@@ -713,6 +725,12 @@
         "swarming": {
           "can_use_on_swarming_builders": true
         },
+        "test": "sync_unit_tests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "ui_base_unittests"
       },
       {