Revert of [Sync] Merge sync_unit_tests into components_unit_tests.

testing/buildbot/gn_isolate_map.pyl

 ## Copyright 2015 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # gn_isolate_map.pyl - A mapping of Ninja build target names to GN labels and
 # test type classifications for the tests that are run on the bots.
 #
 # This mapping is used by MB so that we can uniformly refer to test binaries
 # by their Ninja target names in the recipes and not need to worry about how
 # they are referred to in GN or GYP specifically (the GYP target name is pretty
@@ skipping 508 matching lines @@
     "type": "console_test_launcher",
   },
   "sql_unittests": {
     "label": "//sql:sql_unittests",
     "type": "console_test_launcher",
   },
   "sync_integration_tests": {
     "label": "//chrome/test:sync_integration_tests",
     "type": "windowed_test_launcher",
   },
+  "sync_unit_tests": {
+    "label": "//components/sync:sync_unit_tests",
+    "type": "console_test_launcher",
+  },
   "tab_capture_end2end_tests": {
     "label": "//chrome/test:browser_tests",
     "type": "gpu_browser_test",
     "gtest_filter": "CastStreamingApiTestWithPixelOutput.EndToEnd*:TabCaptureApiPixelTest.EndToEnd*",
   },
   "telemetry_gpu_integration_test": {
     "label": "//chrome/test:telemetry_gpu_integration_test",
     "type": "script",
     "script": "//testing/scripts/run_gpu_integration_test_as_googletest.py",
     "args": [
@@ skipping 89 matching lines @@
   },
   "wm_unittests": {
     "label": "//ui/wm:wm_unittests",
     "type": "windowed_test_launcher",
   },
   "wtf_unittests": {
     "label": "//third_party/WebKit/Source/wtf:wtf_unittests",
     "type": "console_test_launcher",
   },
 }