Switch to standard integer types in third_party/crashpad/.

third_party/crashpad/crashpad/test/multiprocess_exec_test_child.cc

 // Copyright 2014 The Crashpad Authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
 #include <errno.h>
 #include <limits.h>
+#include <stddef.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <sys/types.h>
 
 #include <algorithm>
 
 #if defined(__APPLE__) || defined(__linux__)
 #define OS_POSIX 1
 #elif defined(_WIN32)
 #define OS_WIN 1
@@ skipping 48 matching lines @@
   DWORD bytes_written;
   if (!WriteFile(
           GetStdHandle(STD_OUTPUT_HANDLE), &c, 1, &bytes_written, nullptr) ||
       bytes_written != 1) {
     abort();
   }
 #endif  // OS_POSIX
 
   return 0;
 }