[Sync] Fix test support targets + duplicate namespaces.

ios/chrome/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")
 import("//ios/web/js_compile.gni")
 import("//third_party/protobuf/proto_library.gni")
 
 declare_args() {
   google_test_gaia_client_id = ""
@@ skipping 798 matching lines @@
     "//components/history/ios/browser",
     "//components/keyed_service/core",
     "//components/keyed_service/ios",
     "//components/pref_registry:test_support",
     "//components/signin/core/browser",
     "//components/signin/core/browser",
     "//components/signin/core/browser:test_support",
     "//components/signin/ios/browser",
     "//components/signin/ios/browser:test_support",
     "//components/sync",
-    "//components/sync:test_support_sync_driver",
+    "//components/sync:test_support_driver",
     "//components/syncable_prefs",
     "//components/syncable_prefs:test_support",
     "//components/user_prefs",
     "//components/webdata_services",
     "//ios/chrome/browser",
     "//ios/chrome/browser/signin",
     "//ios/chrome/common",
     "//ios/chrome/test",
     "//ios/public/provider/chrome/browser",
     "//ios/public/provider/chrome/browser:test_support",
     "//ios/web",
     "//net:test_support",
     "//testing/gmock",
     "//testing/gtest",
     "//ui/base",
     "//url",
   ]
 }