[Sync] Rename csync namespace to syncer

sync/internal_api/change_reorder_buffer.h

Index: sync/internal_api/change_reorder_buffer.h
diff --git a/sync/internal_api/change_reorder_buffer.h b/sync/internal_api/change_reorder_buffer.h
index 44773b83d4c4f87854866b792792aed2d38ae03c..81f4f6d1a4aae98f34c7bfbcdc90d6762ccd06e2 100644
--- a/sync/internal_api/change_reorder_buffer.h
+++ b/sync/internal_api/change_reorder_buffer.h
@@ -19,7 +19,7 @@
 #include "sync/internal_api/public/change_record.h"
 #include "sync/protocol/sync.pb.h"
 
-namespace csync {
+namespace syncer {
 
 // ChangeReorderBuffer is a utility type which accepts an unordered set
 // of changes (via its Push methods), and yields an ImmutableChangeRecordList
@@ -119,6 +119,6 @@ class ChangeReorderBuffer {
   DISALLOW_COPY_AND_ASSIGN(ChangeReorderBuffer);
 };
 
-}  // namespace csync
+}  // namespace syncer
 
 #endif  // SYNC_INTERNAL_API_CHANGE_REORDER_BUFFER_H_