Stop using ScopedAllowIO in content::ResourceDispatcherHostImpl

net/http/http_transaction_delegate.h

 // 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.
 
 #ifndef NET_HTTP_HTTP_TRANSACTION_DELEGATE_H_
 #define NET_HTTP_HTTP_TRANSACTION_DELEGATE_H_
 
 namespace net {
 
 // Delegate class receiving notifications when cache actions start and finish,
 // i.e. when the object starts and finishes waiting on an underlying cache.
 // The owner of a HttpTransaction can use this to register a delegate to
 // receive notifications when these events happen.
 class HttpTransactionDelegate {
  public:
   virtual ~HttpTransactionDelegate() {}
   virtual void OnCacheActionStart() = 0;
   virtual void OnCacheActionFinish() = 0;
+  virtual void OnRequestBodyInitialized(uint64 size) {}
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_TRANSACTION_DELEGATE_H_