win: Work towards getting 'minidump' to compile

minidump/minidump_file_writer.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,
@@ skipping 107 matching lines @@
   CHECK(rv.second) << "stream_type " << stream_type << " already present";
 
   streams_.push_back(stream.release());
 
   DCHECK_EQ(streams_.size(), stream_types_.size());
 }
 
 bool MinidumpFileWriter::WriteEverything(FileWriterInterface* file_writer) {
   DCHECK_EQ(state(), kStateMutable);
 
-  off_t start_offset = file_writer->Seek(0, SEEK_CUR);
+  FileOffset start_offset = file_writer->Seek(0, SEEK_CUR);
   if (start_offset < 0) {
     return false;
   }
 
   if (!MinidumpWritable::WriteEverything(file_writer)) {
     return false;
   }
 
-  off_t end_offset = file_writer->Seek(0, SEEK_CUR);
+  FileOffset end_offset = file_writer->Seek(0, SEEK_CUR);
   if (end_offset < 0) {
     return false;
   }
 
   // Now that the entire minidump file has been completely written, go back to
   // the beginning and rewrite the header with the correct signature to identify
   // it as a valid minidump file.
   header_.Signature = MINIDUMP_SIGNATURE;
 
   if (file_writer->Seek(start_offset, SEEK_SET) != 0) {
@@ skipping 72 matching lines @@
   for (internal::MinidumpStreamWriter* stream : streams_) {
     iov.iov_base = stream->DirectoryListEntry();
     iov.iov_len = sizeof(MINIDUMP_DIRECTORY);
     iovecs.push_back(iov);
   }
 
   return file_writer->WriteIoVec(&iovecs);
 }
 
 }  // namespace crashpad