Revert of [Sync] Merge sync_unit_tests into components_unit_tests, take 2.

testing/buildbot/chromium.memory.json

 {
   "Linux ASan LSan Tests (1)": {
     "gtest_tests": [
       {
         "swarming": {
           "can_use_on_swarming_builders": true
         },
         "test": "accessibility_unittests"
       },
       {
@@ skipping 198 matching lines @@
         "test": "skia_unittests"
       },
       {
         "swarming": {
           "can_use_on_swarming_builders": true
         },
         "test": "sql_unittests"
       },
       {
         "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "sync_unit_tests"
+      },
+      {
+        "swarming": {
           "can_use_on_swarming_builders": true
         },
         "test": "ui_base_unittests"
       },
       {
         "swarming": {
           "can_use_on_swarming_builders": true,
           "shards": 2
         },
         "test": "unit_tests"
@@ skipping 268 matching lines @@
         },
         "test": "skia_unittests"
       },
       {
         "swarming": {
           "can_use_on_swarming_builders": true
         },
         "test": "sql_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "sync_unit_tests"
+      },
+      {
         "test": "ui_arc_unittests"
       },
       {
         "swarming": {
           "can_use_on_swarming_builders": true
         },
         "test": "ui_base_unittests"
       },
       {
         "test": "ui_chromeos_unittests"
@@ skipping 189 matching lines @@
       {
         "swarming": {
           "can_use_on_swarming_builders": true
         },
         "test": "sql_unittests"
       },
       {
         "swarming": {
           "can_use_on_swarming_builders": true
         },
+        "test": "sync_unit_tests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "ui_base_unittests"
       },
       {
         "swarming": {
           "can_use_on_swarming_builders": true
         },
         "test": "unit_tests"
       },
       {
         "swarming": {
@@ skipping 15 matching lines @@
       },
       {
         "swarming": {
           "can_use_on_swarming_builders": true
         },
         "test": "wtf_unittests"
       }
     ]
   }
 }