[Sync] Move //components/sync to the syncer namespace.

components/sync/api/model_type_service.cc

Index: components/sync/api/model_type_service.cc
diff --git a/components/sync/api/model_type_service.cc b/components/sync/api/model_type_service.cc
index 59ed6ff266c8b8a7369b6121ca011a22f2222e20..6efacdb6ff8bc6e7b716602bdd552e6b5d3a01b5 100644
--- a/components/sync/api/model_type_service.cc
+++ b/components/sync/api/model_type_service.cc
@@ -9,11 +9,11 @@
 #include "components/sync/api/data_type_error_handler.h"
 #include "components/sync/api/model_type_change_processor.h"
 
-namespace syncer_v2 {
+namespace syncer {
 
 ModelTypeService::ModelTypeService(
     const ChangeProcessorFactory& change_processor_factory,
-    syncer::ModelType type)
+    ModelType type)
     : change_processor_factory_(change_processor_factory), type_(type) {}
 
 ModelTypeService::~ModelTypeService() {}
@@ -30,7 +30,7 @@ ConflictResolution ModelTypeService::ResolveConflict(
 }
 
 void ModelTypeService::OnSyncStarting(
-    std::unique_ptr<syncer::DataTypeErrorHandler> error_handler,
+    std::unique_ptr<DataTypeErrorHandler> error_handler,
     const ModelTypeChangeProcessor::StartCallback& start_callback) {
   CreateChangeProcessor();
   change_processor_->OnSyncStarting(std::move(error_handler), start_callback);
@@ -58,4 +58,4 @@ void ModelTypeService::clear_change_processor() {
   change_processor_.reset();
 }
 
-}  // namespace syncer_v2
+}  // namespace syncer