Support sending a sliced file in chromium....

net/url_request/url_request.cc

Index: net/url_request/url_request.cc
===================================================================
--- net/url_request/url_request.cc	(revision 42417)
+++ net/url_request/url_request.cc	(working copy)
@@ -86,12 +86,16 @@
   upload_->AppendBytes(bytes, bytes_len);
 }
 
-void URLRequest::AppendFileRangeToUpload(const FilePath& file_path,
-                                         uint64 offset, uint64 length) {
+void URLRequest::AppendFileRangeToUpload(
+    const FilePath& file_path,
+    uint64 offset,
+    uint64 length,
+    const base::Time& expected_modification_time) {
   DCHECK(file_path.value().length() > 0 && length > 0);
   if (!upload_)
     upload_ = new UploadData();
-  upload_->AppendFileRange(file_path, offset, length);
+  upload_->AppendFileRange(file_path, offset, length,
+                           expected_modification_time);
 }
 
 void URLRequest::set_upload(net::UploadData* upload) {