[Coverity] Fix uninitialized member, pass-by-val.

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

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef NATIVE_CLIENT_SRC_TRUSTED_PLUGIN_PNACL_TRANSLATE_THREAD_H_
 #define NATIVE_CLIENT_SRC_TRUSTED_PLUGIN_PNACL_TRANSLATE_THREAD_H_
 
 #include "native_client/src/include/nacl_macros.h"
 #include "native_client/src/include/nacl_scoped_ptr.h"
 #include "native_client/src/include/nacl_string.h"
@@ skipping 15 matching lines @@
 class NaClSubprocess;
 class Plugin;
 class PnaclResources;
 
 class PnaclTranslateThread {
  public:
   PnaclTranslateThread();
   virtual ~PnaclTranslateThread();
   // TODO(jvoung/dschuff): handle surfaway issues when coordinator/plugin
   // goes away. This data may have to be refcounted not touched in that case.
-  void RunTranslate(pp::CompletionCallback finish_callback,
+  void RunTranslate(const pp::CompletionCallback& finish_callback,
                     const Manifest* manifest,
                     const Manifest* ld_manifest,
                     LocalTempFile* obj_file,
                     LocalTempFile* nexe_file,
                     nacl::DescWrapper* pexe_wrapper,
                     ErrorInfo* error_info,
                     PnaclResources* resources,
                     Plugin* plugin);
   bool SubprocessesShouldDie();
   // Signal the translate thread and subprocesses that they should stop.
@@ skipping 27 matching lines @@
   LocalTempFile* obj_file_;
   LocalTempFile* nexe_file_;
   nacl::DescWrapper* pexe_wrapper_;
   ErrorInfo *error_info_;
   PnaclResources* resources_;
   Plugin* plugin_;
 };
 
 }
 #endif // NATIVE_CLIENT_SRC_TRUSTED_PLUGIN_PNACL_TRANSLATE_THREAD_H_