Migrate more files to histogram_macros.h from histogram.h.

components/sync/engine_impl/model_type_registry.cc

 // Copyright 2014 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.
 
 #include "components/sync/engine_impl/model_type_registry.h"
 
 #include <stddef.h>
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/memory/ptr_util.h"
-#include "base/metrics/histogram.h"
+#include "base/metrics/histogram_macros.h"
 #include "base/observer_list.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "components/sync/base/cryptographer.h"
 #include "components/sync/engine/activation_context.h"
 #include "components/sync/engine/commit_queue.h"
 #include "components/sync/engine/model_type_processor.h"
 #include "components/sync/engine_impl/cycle/directory_type_debug_info_emitter.h"
 #include "components/sync/engine_impl/cycle/non_blocking_type_debug_info_emitter.h"
 #include "components/sync/engine_impl/directory_commit_contributor.h"
 #include "components/sync/engine_impl/directory_update_handler.h"
@@ skipping 322 matching lines @@
 
 ModelTypeSet ModelTypeRegistry::GetEnabledNonBlockingTypes() const {
   ModelTypeSet enabled_non_blocking_types;
   for (const auto& worker : model_type_workers_) {
     enabled_non_blocking_types.Put(worker->GetModelType());
   }
   return enabled_non_blocking_types;
 }
 
 }  // namespace syncer