Run Pepper unit tests in Native Client, part 1 (pepper repo)....

tests/test_url_loader.cc

 // Copyright (c) 2010 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_url_loader.h"
 
 #include <stdio.h>
 #include <string.h>
 
 #include "ppapi/c/dev/ppb_file_io_dev.h"
@@ skipping 37 matching lines @@
   static void Handler(void* user_data, int32_t result) {
     static_cast<TestCompletionCallback*>(user_data)->result_ = result;
     g_testing_interface->QuitMessageLoop();
   }
 
   int32_t result_;
 };
 
 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));
   return method + std::string(" failed with error: ") + error_as_string;
 }
 
 }  // namespace
 
 bool TestURLLoader::Init() {
   g_testing_interface = reinterpret_cast<PPB_Testing_Dev const*>(
       pp::Module::Get()->GetBrowserInterface(PPB_TESTING_DEV_INTERFACE));
   if (!g_testing_interface) {
     // Give a more helpful error message for the testing interface being gone
@@ skipping 237 matching lines @@
       return "URLLoader::Open() failed to block a cross-origin request.";
     } else {
       return ReportError("URLLoader::Open()", rv);
     }
   }
 
   return "";
 }
 
 // TODO(darin): Add a test for GrantUniversalAccess.