Switch to standard integer types in ppapi/.

ppapi/tests/test_file_chooser.cc

 // Copyright 2015 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_file_chooser.h"
 
+#include <stddef.h>
+
 #include "ppapi/c/pp_errors.h"
 #include "ppapi/c/ppb_file_io.h"
 #include "ppapi/cpp/dev/file_chooser_dev.h"
 #include "ppapi/cpp/file_io.h"
 #include "ppapi/cpp/trusted/file_chooser_trusted.h"
 #include "ppapi/cpp/var.h"
 
 namespace {
 
 // Test data written by WriteDefaultContentsToFile().
@@ skipping 171 matching lines @@
 
   TestCompletionCallbackWithOutput<std::vector<pp::FileRef>>
       filechooser_callback(instance_->pp_instance(), callback_type());
   filechooser_callback.WaitForResult(
       file_chooser.Show(filechooser_callback.GetCallback()));
 
   const std::vector<pp::FileRef>& output_ref = filechooser_callback.output();
   ASSERT_EQ(0u, output_ref.size());
   PASS();
 }