net: Fix DCHECK failure on large file upload

net/base/upload_file_element_reader.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/base/upload_file_element_reader.h"
 
 #include "base/bind.h"
 #include "base/file_util.h"
 #include "base/location.h"
 #include "base/task_runner_util.h"
@@ skipping 204 matching lines @@
   if (!callback.is_null())
     callback.Run(result);
 }
 
 void UploadFileElementReader::OnReadCompleted(
     ScopedFileStreamPtr file_stream,
     const CompletionCallback& callback,
     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())
     callback.Run(result);
 }
 
 UploadFileElementReader::ScopedOverridingContentLengthForTests::
 ScopedOverridingContentLengthForTests(uint64 value) {
   overriding_content_length = value;
 }
@@ skipping 38 matching lines @@
 uint64 UploadFileElementReaderSync::BytesRemaining() const {
   return bytes_remaining_;
 }
 
 int UploadFileElementReaderSync::Read(IOBuffer* buf,
                                       int buf_length,
                                       const CompletionCallback& callback) {
   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;
 }
 
 }  // namespace net