Change file op |ssize_t|s to FileOperationResult

tools/crashpad_database_util.cc

 // 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 548 matching lines @@
     CrashReportDatabase::OperationStatus status =
         database->PrepareNewCrashReport(&new_report);
     if (status != CrashReportDatabase::kNoError) {
       return EXIT_FAILURE;
     }
 
     CrashReportDatabase::CallErrorWritingCrashReport
         call_error_writing_crash_report(database.get(), new_report);
 
     char buf[4096];
-    ssize_t read_result;
+    FileOperationResult read_result;
     do {
       read_result = file_reader->Read(buf, sizeof(buf));
       if (read_result < 0) {
         return EXIT_FAILURE;
       }
       if (read_result > 0 &&
           !LoggingWriteFile(new_report->handle, buf, read_result)) {
         return EXIT_FAILURE;
       }
     } while (read_result == sizeof(buf));
@@ skipping 25 matching lines @@
 
 #if defined(OS_POSIX)
 int main(int argc, char* argv[]) {
   return crashpad::DatabaseUtilMain(argc, argv);
 }
 #elif defined(OS_WIN)
 int wmain(int argc, wchar_t* argv[]) {
   return crashpad::ToolSupport::Wmain(argc, argv, crashpad::DatabaseUtilMain);
 }
 #endif  // OS_POSIX