net: Make UploadDataStream::Init() asynchronous.

net/base/upload_data.cc

Index: net/base/upload_data.cc
diff --git a/net/base/upload_data.cc b/net/base/upload_data.cc
index b13e9091e8cb0051caeb26a516ba1cd806f600d0..782e713f1ec22ecce5569d56efbc489bfe57753a 100644
--- a/net/base/upload_data.cc
+++ b/net/base/upload_data.cc
@@ -120,8 +120,6 @@ void UploadData::Element::ResetOffset() {
   // Delete the file stream if already opened, so we can reread the file from
   // the beginning.
   if (file_stream_) {
-    // Temporarily allow until fix: http://crbug.com/72001.
-    base::ThreadRestrictions::ScopedAllowIO allow_io;

[eroman, 2012/08/09 05:29:33]

This removal seems unrelated to this changelist (I don't see any changes made to
CloseSync()), or am I missing something?

[hashimoto, 2012/08/09 13:35:02]

UploadData::ResetOffset() is the only user of
UploadData::Element::ResetOffset(), and UploadDataStream::Init() is the only
user of UploadData::ResetOffset().

|allow_io| here can be removed since UploadDataStream::Init() calls this method
only on IO allowed threads.

     file_stream_->CloseSync();
     delete file_stream_;
     file_stream_ = NULL;