Fix full ChromeOS builds - generated cryptauth proto file has moved.

ChromeOS cryptauth unittest use cryptauth_api.pb which moved from
components/cryptauth to chromeos/services/device_sync in bug 912743.
A file still included that file from the old path (and the new path)
which worked in trees where an earlier tree had generated it but didn't
work in a clean tree. The files presumably had the same include guards
so that is was ok to include both.

TBR=khorimoto@chromium.org

Bug: 912743
Change-Id: I6708c674f5fd99c94e233df5ec9b9c462c7814ad
Reviewed-on: https://chromium-review.googlesource.com/c/1373826Reviewed-by: Daniel Bratell <bratell@opera.com>
Commit-Queue: Daniel Bratell <bratell@opera.com>
Cr-Commit-Position: refs/heads/master@{#615911}

components/cryptauth/cryptauth_client_impl_unittest.cc

@@ -13,7 +13,6 @@
 #include "chromeos/services/device_sync/proto/cryptauth_api.pb.h"
 #include "chromeos/services/device_sync/proto/enum_util.h"
 #include "components/cryptauth/cryptauth_api_call_flow.h"
-#include "components/cryptauth/proto/cryptauth_api.pb.h"
 #include "components/cryptauth/switches.h"
 #include "net/traffic_annotation/network_traffic_annotation_test_helper.h"
 #include "services/identity/public/cpp/identity_test_environment.h"