[Sync] Split fake ModelTypeService impl out of SMTP tests.

components/sync/api/stub_model_type_service.h

Index: components/sync/api/stub_model_type_service.h
diff --git a/components/sync/api/fake_model_type_service.h b/components/sync/api/stub_model_type_service.h
similarity index 78%
copy from components/sync/api/fake_model_type_service.h
copy to components/sync/api/stub_model_type_service.h
index e02a5e17c47d687cbc78ae4b09b1a7744c191f61..f8c10f1c83f452058c2781184fc65c903bc761ce 100644
--- a/components/sync/api/fake_model_type_service.h
+++ b/components/sync/api/stub_model_type_service.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef COMPONENTS_SYNC_API_FAKE_MODEL_TYPE_SERVICE_H_
-#define COMPONENTS_SYNC_API_FAKE_MODEL_TYPE_SERVICE_H_
+#ifndef COMPONENTS_SYNC_API_STUB_MODEL_TYPE_SERVICE_H_
+#define COMPONENTS_SYNC_API_STUB_MODEL_TYPE_SERVICE_H_
 
 #include <memory>
 #include <string>
@@ -14,12 +14,12 @@ namespace syncer_v2 {
 
 // A non-functional implementation of ModelTypeService for
 // testing purposes.
-class FakeModelTypeService : public ModelTypeService {
+class StubModelTypeService : public ModelTypeService {
  public:
-  FakeModelTypeService();
-  explicit FakeModelTypeService(
+  StubModelTypeService();
+  explicit StubModelTypeService(
       const ChangeProcessorFactory& change_processor_factory);
-  ~FakeModelTypeService() override;
+  ~StubModelTypeService() override;
 
   std::unique_ptr<MetadataChangeList> CreateMetadataChangeList() override;
   syncer::SyncError MergeSyncData(
@@ -39,4 +39,4 @@ class FakeModelTypeService : public ModelTypeService {
 
 }  // namespace syncer_v2
 
-#endif  // COMPONENTS_SYNC_API_FAKE_MODEL_TYPE_SERVICE_H_
+#endif  // COMPONENTS_SYNC_API_STUB_MODEL_TYPE_SERVICE_H_