[Sync] Move sync/{internal_api,syncable} into syncer namespace

sync/syncable/nigori_util.h

Index: sync/syncable/nigori_util.h
diff --git a/sync/syncable/nigori_util.h b/sync/syncable/nigori_util.h
index 940b13592e37817b868e39cfc9b8bfb7e2e07aa9..7425d2405b37483aa5c79c58c58c0b2173191637 100644
--- a/sync/syncable/nigori_util.h
+++ b/sync/syncable/nigori_util.h
@@ -12,14 +12,13 @@
 #include "sync/internal_api/public/syncable/model_type.h"
 #include "sync/protocol/nigori_specifics.pb.h"
 
-namespace syncer {
-class Cryptographer;
-}
-
 namespace sync_pb {
 class EntitySpecifics;
 }
 
+namespace syncer {
+class Cryptographer;
+
 namespace syncable {
 
 const char kEncryptedString[] = "encrypted";
@@ -71,5 +70,6 @@ bool UpdateEntryWithEncryption(
     MutableEntry* entry);
 
 }  // namespace syncable
+}  // namespace syncer
 
 #endif  // SYNC_SYNCABLE_NIGORI_UTIL_H_