Revert of [Sync] Merge sync_unit_tests into components_unit_tests.

testing/buildbot/chromium.memory.full.json

Index: testing/buildbot/chromium.memory.full.json
diff --git a/testing/buildbot/chromium.memory.full.json b/testing/buildbot/chromium.memory.full.json
index 173dd033cacc4af29e5ef2721715c74602db66ba..6e5ea1866f7b7f0eee63afe0a12505d7f7406da0 100644
--- a/testing/buildbot/chromium.memory.full.json
+++ b/testing/buildbot/chromium.memory.full.json
@@ -360,6 +360,12 @@
         "swarming": {
           "can_use_on_swarming_builders": true
         },
+        "test": "sync_unit_tests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "ui_base_unittests"
       },
       {
@@ -645,6 +651,12 @@
           "can_use_on_swarming_builders": true
         },
         "test": "sql_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "sync_unit_tests"
       },
       {
         "swarming": {
@@ -898,6 +910,12 @@
         "swarming": {
           "can_use_on_swarming_builders": true
         },
+        "test": "sync_unit_tests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "ui_base_unittests"
       },
       {