Trivial: remove unused includes

These are leftovers from previous patches.

Bug: 922971
Change-Id: Ic4cab0235c9b139c5d56221178d36f75b1e38c88
Reviewed-on: https://chromium-review.googlesource.com/c/1462896
Commit-Queue: Mikel Astiz <mastiz@chromium.org>
Commit-Queue: Mohamed Amir Yosef <mamir@chromium.org>
Auto-Submit: Mikel Astiz <mastiz@chromium.org>
Reviewed-by: Mohamed Amir Yosef <mamir@chromium.org>
Cr-Commit-Position: refs/heads/master@{#630721}

ios/web_view/internal/sync/cwv_sync_controller_unittest.mm

@@ -14,7 +14,6 @@
 #include "components/browser_sync/profile_sync_service_mock.h"
 #include "components/browser_sync/profile_sync_test_util.h"
 #include "components/signin/core/browser/account_tracker_service.h"
-#include "components/signin/core/browser/device_id_helper.h"
 #include "components/signin/core/browser/fake_account_fetcher_service.h"
 #include "components/signin/core/browser/fake_profile_oauth2_token_service.h"
 #include "components/signin/core/browser/fake_signin_manager.h"
@@ -23,12 +22,7 @@
 #include "components/signin/ios/browser/fake_profile_oauth2_token_service_ios_provider.h"
 #include "components/signin/ios/browser/profile_oauth2_token_service_ios_delegate.h"
 #include "components/signin/ios/browser/profile_oauth2_token_service_ios_provider.h"
-#include "components/sync/device_info/device_info_sync_service_impl.h"
-#include "components/sync/device_info/local_device_info_provider_impl.h"
 #include "components/sync/driver/sync_service_observer.h"
-#include "components/sync/model/test_model_type_store_service.h"
-#include "components/version_info/version_info.h"
-#include "components/version_info/version_string.h"
 #include "google_apis/gaia/google_service_auth_error.h"
 #import "ios/web/public/test/fakes/test_web_state.h"
 #include "ios/web/public/test/test_web_thread_bundle.h"