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

components/sync/core/model_type_store_backend.h

Index: components/sync/core/model_type_store_backend.h
diff --git a/components/sync/core/model_type_store_backend.h b/components/sync/core/model_type_store_backend.h
index a6e9df1cbe321e41fa83984d6592c37c00dfcb92..00f74bc27d5d4f0b4f1ad655291ad7fac7904e03 100644
--- a/components/sync/core/model_type_store_backend.h
+++ b/components/sync/core/model_type_store_backend.h
@@ -20,7 +20,7 @@ class Env;
 class WriteBatch;
 }  // namespace leveldb
 
-namespace syncer_v2 {
+namespace syncer {
 
 // ModelTypeStoreBackend handles operations with leveldb. It is oblivious of the
 // fact that it is called from separate thread (with the exception of ctor),
@@ -103,6 +103,6 @@ class ModelTypeStoreBackend
   DISALLOW_COPY_AND_ASSIGN(ModelTypeStoreBackend);
 };
 
-}  // namespace syncer_v2
+}  // namespace syncer
 
 #endif  // COMPONENTS_SYNC_CORE_MODEL_TYPE_STORE_BACKEND_H_