[Sync] Fix test support targets + duplicate namespaces.

ios/chrome/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/ios/rules.gni")
 import("//ios/build/config.gni")
 import("//testing/test.gni")
 
 bundle_data("ios_chrome_unittests_bundle_data") {
   testonly = true
@@ skipping 90 matching lines @@
     "//components/metrics",
     "//components/metrics:test_support",
     "//components/password_manager/core/browser",
     "//components/password_manager/core/browser:test_support",
     "//components/password_manager/core/common",
     "//components/prefs:test_support",
     "//components/proxy_config:proxy_config",
     "//components/signin/core/browser:test_support",
     "//components/signin/ios/browser:test_support",
     "//components/ssl_config:ssl_config",
-    "//components/sync:test_support_sync_driver",
+    "//components/sync:test_support_driver",
     "//components/syncable_prefs:test_support",
     "//components/update_client",
     "//components/version_info",
     "//ios/chrome/app",
     "//ios/chrome/app/resources:packed_resources",
     "//ios/chrome/browser",
     "//ios/chrome/browser:test_support",
     "//ios/chrome/browser/signin:unit_tests",
     "//ios/chrome/common",
     "//ios/chrome/test",
@@ skipping 10 matching lines @@
     "//testing/gtest",
     "//third_party/google_toolbox_for_mac",
     "//third_party/ocmock",
     "//ui/base:base",
     "//ui/gfx:test_support",
     "//ui/strings:ui_strings",
   ]
 
   assert_no_deps = ios_assert_no_deps
 }