Componentize ProfileSyncServiceMock

components/browser_sync/browser/BUILD.gn

 # 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.
 
 import("//build/config/features.gni")
 
 source_set("browser") {
   sources = [
     "profile_sync_components_factory_impl.cc",
     "profile_sync_components_factory_impl.h",
@@ skipping 58 matching lines @@
     "//components/syncable_prefs:test_support",
     "//components/version_info",
     "//components/version_info:generate_version_info",
     "//google_apis",
     "//net",
     "//testing/gmock",
     "//testing/gtest",
     "//ui/base",
   ]
 }
+
+source_set("test_support") {
+  testonly = true
+  sources = [
+    "profile_sync_service_mock.cc",
+    "profile_sync_service_mock.h",
+  ]
+
+  deps = [
+    ":browser",
+    "//base",
+    "//components/sync_driver:test_support",
+    "//google_apis",
+    "//testing/gmock",
+  ]
+}