[Sync] Rename csync namespace to syncer

sync/syncable/entry.h

Index: sync/syncable/entry.h
diff --git a/sync/syncable/entry.h b/sync/syncable/entry.h
index 9ace7aefb72b7e9f21cb39138ca8e850f494f470..8a00f756050c7d341285decf25e8736ffe549afa 100644
--- a/sync/syncable/entry.h
+++ b/sync/syncable/entry.h
@@ -8,7 +8,7 @@
 
 #include "sync/syncable/entry_kernel.h"
 
-namespace csync {
+namespace syncer {
 class ReadNode;
 }
 
@@ -141,7 +141,7 @@ class Entry {
 
  private:
   friend class Directory;
-  friend class csync::ReadNode;
+  friend class syncer::ReadNode;
   friend std::ostream& operator << (std::ostream& s, const Entry& e);
 
   DISALLOW_COPY_AND_ASSIGN(Entry);