[Sync] Rename csync namespace to syncer

sync/engine/process_commit_response_command.h

Index: sync/engine/process_commit_response_command.h
diff --git a/sync/engine/process_commit_response_command.h b/sync/engine/process_commit_response_command.h
index 98de2f253f575c7e4c9d1635d68995740af690ed..80c5753c0f176501754b322c5e93ec7eb799ff52 100644
--- a/sync/engine/process_commit_response_command.h
+++ b/sync/engine/process_commit_response_command.h
@@ -21,7 +21,7 @@ class MutableEntry;
 class Directory;
 }
 
-namespace csync {
+namespace syncer {
 
 namespace sessions {
 class OrderedCommitSet;
@@ -131,6 +131,6 @@ class ProcessCommitResponseCommand : public ModelChangingSyncerCommand {
   DISALLOW_COPY_AND_ASSIGN(ProcessCommitResponseCommand);
 };
 
-}  // namespace csync
+}  // namespace syncer
 
 #endif  // SYNC_ENGINE_PROCESS_COMMIT_RESPONSE_COMMAND_H_