[Sync] Refactor GetEncryptedTypes usage.

sync/internal_api/public/base_transaction.h

Index: sync/internal_api/public/base_transaction.h
diff --git a/sync/internal_api/public/base_transaction.h b/sync/internal_api/public/base_transaction.h
index f097fb30dfa18b5934f3521a9d88499e25f49c40..242a6b93545780d0cd96d4ced7d9ef64e5d2af67 100644
--- a/sync/internal_api/public/base_transaction.h
+++ b/sync/internal_api/public/base_transaction.h
@@ -7,6 +7,7 @@
 
 #include "sync/internal_api/public/user_share.h"
 
+#include "sync/internal_api/public/base/model_type.h"
 #include "sync/util/cryptographer.h"
 
 namespace syncer {
@@ -28,6 +29,7 @@ class BaseTransaction {
   // Provide access to the underlying syncable objects from BaseNode.
   virtual syncable::BaseTransaction* GetWrappedTrans() const = 0;
   Cryptographer* GetCryptographer() const;
+  ModelTypeSet GetEncryptedTypes() const;
 
   syncable::Directory* GetDirectory() const {
     return directory_;
@@ -45,8 +47,6 @@ class BaseTransaction {
   DISALLOW_COPY_AND_ASSIGN(BaseTransaction);
 };
 
-ModelTypeSet GetEncryptedTypes(const BaseTransaction* trans);
-
 }  // namespace syncer
 
 #endif  // SYNC_INTERNAL_API_PUBLIC_BASE_TRANSACTION_H_