[Sync] Remove unneeded 'using syncer::' lines and 'syncer::' scopings

sync/internal_api/syncapi_server_connection_manager_unittest.cc

Index: sync/internal_api/syncapi_server_connection_manager_unittest.cc
diff --git a/sync/internal_api/syncapi_server_connection_manager_unittest.cc b/sync/internal_api/syncapi_server_connection_manager_unittest.cc
index cf5dbf80012fb282dfad560a1c6d11cfee26bf1b..f90c5e8a09035606986d163ecef4e8fb9a452ffa 100644
--- a/sync/internal_api/syncapi_server_connection_manager_unittest.cc
+++ b/sync/internal_api/syncapi_server_connection_manager_unittest.cc
@@ -16,14 +16,11 @@
 #include "sync/internal_api/public/http_post_provider_interface.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
-using base::TimeDelta;
-using syncer::HttpResponse;
-using syncer::ServerConnectionManager;
-using syncer::ScopedServerStatusWatcher;
-
 namespace syncer {
 namespace {
 
+using base::TimeDelta;
+
 class BlockingHttpPost : public HttpPostProviderInterface {
  public:
   BlockingHttpPost() : wait_for_abort_(false, false) {}