[SPDY] Avoid leaking bytes from the session flow control receive window

net/spdy/spdy_http_stream.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/spdy/spdy_http_stream.h"
 
 #include <algorithm>
 #include <list>
 
 #include "base/bind.h"
@@ skipping 118 matching lines @@
   if (stream_) {
     CHECK(stream_->is_idle());
     CHECK(!stream_->closed());
   }
   CHECK(buf);
   CHECK(buf_len);
   CHECK(!callback.is_null());
 
   // If we have data buffered, complete the IO immediately.
   if (!response_body_queue_.IsEmpty()) {
-    size_t bytes_consumed = response_body_queue_.Dequeue(buf->data(), buf_len);
-    if (stream_)
-      stream_->IncreaseRecvWindowSize(bytes_consumed);
-    return bytes_consumed;
+    return response_body_queue_.Dequeue(buf->data(), buf_len);
   } else if (stream_closed_) {
     return closed_stream_status_;
   }
 
   CHECK(callback_.is_null());
   CHECK(!user_buffer_);
   CHECK_EQ(0, user_buffer_len_);
 
   callback_ = callback;
   user_buffer_ = buf;
@@ skipping 415 matching lines @@
 bool SpdyHttpStream::IsSpdyHttpStream() const {
   return true;
 }
 
 void SpdyHttpStream::Drain(HttpNetworkSession* session) {
   Close(false);
   delete this;
 }
 
 }  // namespace net