Fix build failure on linux_arm_cross_compile.

chrome/test/data/nacl/manifest_file/irt_manifest_file_test.cc

 /*
  * Copyright 2014 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.
  */
 
 //
 // Test for resource open before PPAPI initialization.
 //
 
+#include <pthread.h>
 #include <stdio.h>
 #include <string.h>
 
 #include <sstream>
 #include <string>
 #include <vector>
 
 #include "native_client/src/untrusted/irt/irt.h"
 #include "native_client/src/untrusted/nacl/nacl_irt.h"
 
@@ skipping 122 matching lines @@
 
   virtual ~TestInstance() {}
   virtual void HandleMessage(const pp::Var& var_message) {
     if (!var_message.is_string()) {
       return;
     }
     if (var_message.AsString() != "hello") {
       return;
     }
 
+    pthread_t thread;
     // We test the manifest routines again after PPAPI has initialized to
     // ensure that they still work.
     //
     // irt_open_resource() isn't allowed to be called on the main thread once
     // pepper starts, so these tests must happen on a background thread.
-    pthread_create(&thread_, NULL, &RunTestsOnBackgroundThread, NULL);
+    //
+    // TODO(teravest): Check the return value here.
+    pthread_create(&thread, NULL, &RunTestsOnBackgroundThread, NULL);
   }
- private:
-  pthread_t thread_;
 };
 
 class TestModule : public pp::Module {
  public:
   TestModule() : pp::Module() {}
   virtual ~TestModule() {}
 
   virtual pp::Instance* CreateInstance(PP_Instance instance) {
     return new TestInstance(instance);
   }
 };
 
 namespace pp {
 Module* CreateModule() {
   return new TestModule();
 }
 }
 
 int main() {
   RunTests();
   return PpapiPluginMain();
 }