Delete the PNaCl translate thread before deleting object files on surfaway.

ppapi/native_client/src/trusted/plugin/pnacl_coordinator.h

Index: ppapi/native_client/src/trusted/plugin/pnacl_coordinator.h
diff --git a/ppapi/native_client/src/trusted/plugin/pnacl_coordinator.h b/ppapi/native_client/src/trusted/plugin/pnacl_coordinator.h
index 3b533ab5142701b0d72bb62d566dec0e95a28604..321878b9ef7f4c3fa16e17400ced60d91787635a 100644
--- a/ppapi/native_client/src/trusted/plugin/pnacl_coordinator.h
+++ b/ppapi/native_client/src/trusted/plugin/pnacl_coordinator.h
@@ -234,8 +234,8 @@ class PnaclCoordinator: public CallbackSource<FileStreamData> {
   int64_t expected_pexe_size_;   // Expected download total (-1 if unknown).
 
   // The helper thread used to do translations via SRPC.
-  // Keep this last in declaration order to ensure the other variables
-  // haven't been destroyed yet when its destructor runs.
+  // It accesses fields of PnaclCoordinator so it must have a
+  // shorter lifetime.
   nacl::scoped_ptr<PnaclTranslateThread> translate_thread_;
 };