[Sync] Rename csync namespace to syncer

sync/api/sync_error_factory.h

Index: sync/api/sync_error_factory.h
diff --git a/sync/api/sync_error_factory.h b/sync/api/sync_error_factory.h
index ec9f2df0833c878f9de3d62e83bf411798000908..26345065de679f7694d0326a3edcec2f488da328 100644
--- a/sync/api/sync_error_factory.h
+++ b/sync/api/sync_error_factory.h
@@ -11,7 +11,7 @@
 #include "base/location.h"
 #include "sync/api/sync_error.h"
 
-namespace csync {
+namespace syncer {
 
 class SyncErrorFactory {
  public:
@@ -24,6 +24,6 @@ class SyncErrorFactory {
       const std::string& message) = 0;
 };
 
-}  // namespace csync
+}  // namespace syncer
 
 #endif  // SYNC_API_SYNC_ERROR_FACTORY_H_