Adjust PPAPI tests so they can also be run in the NaCl build using PyAuto.

ppapi/tests/test_utils.cc

 // Copyright (c) 2011 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.
 
 #include "ppapi/tests/test_utils.h"
 
 #include <stdio.h>
 
 #include "ppapi/c/pp_errors.h"
 #include "ppapi/cpp/module.h"
 
 const PPB_Testing_Dev* GetTestingInterface() {
   static const PPB_Testing_Dev* g_testing_interface =
       reinterpret_cast<PPB_Testing_Dev const*>(
           pp::Module::Get()->GetBrowserInterface(PPB_TESTING_DEV_INTERFACE));
   return g_testing_interface;
 }
 
 std::string ReportError(const char* method, int32_t error) {
   char error_as_string[12];
-  sprintf(error_as_string, "%d", error);
+  sprintf(error_as_string, "%d", static_cast<int>(error));
   std::string result = method + std::string(" failed with error: ") +
       error_as_string;
   if (error == PP_ERROR_NOSPACE)
     result += ". Did you run the test with --unlimited-quota-for-files?";
   return result;
 }
 
 TestCompletionCallback::TestCompletionCallback(PP_Instance instance)
     : have_result_(false),
       result_(PP_OK_COMPLETIONPENDING),
@@ skipping 22 matching lines @@
   TestCompletionCallback* callback =
       static_cast<TestCompletionCallback*>(user_data);
   callback->result_ = result;
   callback->have_result_ = true;
   callback->run_count_++;
   if (callback->post_quit_task_) {
     callback->post_quit_task_ = false;
     GetTestingInterface()->QuitMessageLoop(callback->instance_);
   }
 }