Add FileWriteMode::kCreateOrFail

test/test.gyp

 # Copyright 2015 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,
@@ skipping 14 matching lines @@
         '../third_party/gtest/gtest.gyp:gtest',
         '../third_party/mini_chromium/mini_chromium.gyp:base',
         '../util/util.gyp:crashpad_util',
       ],
       'include_dirs': [
         '..',
       ],
       'sources': [
         'errors.cc',
         'errors.h',
+        'file.cc',
+        'file.h',
         'gtest_death_check.h',
         'mac/dyld.h',
         'mac/mach_errors.cc',
         'mac/mach_errors.h',
         'mac/mach_multiprocess.cc',
         'mac/mach_multiprocess.h',
         'multiprocess.h',
         'multiprocess_exec.h',
         'multiprocess_exec_posix.cc',
         'multiprocess_exec_win.cc',
@@ skipping 25 matching lines @@
           'link_settings': {
             'libraries': [
               '-lshell32.lib',
             ],
           },
         }],
       ],
     },
   ],
 }