[Sync] Rename csync namespace to syncer

sync/syncable/read_transaction.h

Index: sync/syncable/read_transaction.h
diff --git a/sync/syncable/read_transaction.h b/sync/syncable/read_transaction.h
index b8e34e8a1de74fb393fc56918868f689bd8382b2..a6c51f558985807d5703dbdcb7830737b4d9ca12 100644
--- a/sync/syncable/read_transaction.h
+++ b/sync/syncable/read_transaction.h
@@ -8,7 +8,7 @@
 
 #include "sync/syncable/base_transaction.h"
 
-namespace csync {
+namespace syncer {
 class ReadTransaction;
 }
 
@@ -23,12 +23,12 @@ class ReadTransaction : public BaseTransaction {
   virtual ~ReadTransaction();
 
  protected:  // Don't allow creation on heap, except by sync API wrapper.
-  friend class csync::ReadTransaction;
+  friend class syncer::ReadTransaction;
   void* operator new(size_t size) { return (::operator new)(size); }
 
   DISALLOW_COPY_AND_ASSIGN(ReadTransaction);
 };
 
-}
+}  // namespace syncable
 
 #endif  // SYNC_SYNCABLE_READ_TRANSACTION_H_