net: Fix DCHECK failure on large file upload

net/base/upload_file_element_reader.cc

Index: net/base/upload_file_element_reader.cc
diff --git a/net/base/upload_file_element_reader.cc b/net/base/upload_file_element_reader.cc
index 5bc35337449e37b55f2ffb352cfd5e5635bc483e..f0cf74c34287d74567b2ca5d7d661cc219d557a6 100644
--- a/net/base/upload_file_element_reader.cc
+++ b/net/base/upload_file_element_reader.cc
@@ -222,7 +222,7 @@ void UploadFileElementReader::OnReadCompleted(
     int result) {
   file_stream_.swap(file_stream);
   if (result > 0) {
-    DCHECK_GE(static_cast<int>(bytes_remaining_), result);
+    DCHECK_GE(bytes_remaining_, static_cast<uint64>(result));
     bytes_remaining_ -= result;
   }
   if (!callback.is_null())
@@ -281,7 +281,7 @@ int UploadFileElementReaderSync::Read(IOBuffer* buf,
   const int result = ReadInternal(buf, buf_length, BytesRemaining(),
                                   file_stream_.get());
   if (result > 0) {
-    DCHECK_GE(static_cast<int>(bytes_remaining_), result);
+    DCHECK_GE(bytes_remaining_, static_cast<uint64>(result));
     bytes_remaining_ -= result;
   }
   return result;