Rewrite a DLOG message to make it more readable. Currently the output is:

net/quic/core/reliable_quic_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/quic/core/reliable_quic_stream.h"
 
 #include "base/logging.h"
 #include "net/quic/core/quic_bug_tracker.h"
 #include "net/quic/core/quic_flags.h"
 #include "net/quic/core/quic_flow_controller.h"
@@ skipping 77 matching lines @@
   DCHECK(!(read_side_closed_ && write_side_closed_));
 
   if (frame.fin) {
     fin_received_ = true;
     if (fin_sent_) {
       session_->StreamDraining(id_);
     }
   }
 
   if (read_side_closed_) {
-    DVLOG(1) << ENDPOINT << "Ignoring data in frame " << frame.stream_id;
+    DVLOG(1) << ENDPOINT << "Stream " << frame.stream_id
+             << " is closed for reading. Ignoring newly received stream data.";
     // The subclass does not want to read data:  blackhole the data.
     return;
   }
 
   // This count includes duplicate data received.
   size_t frame_payload_size = frame.data_length;
   stream_bytes_read_ += frame_payload_size;
 
   // Flow control is interested in tracking highest received offset.
   // Only interested in received frames that carry data.
@@ skipping 362 matching lines @@
   }
 }
 
 void ReliableQuicStream::UpdateSendWindowOffset(QuicStreamOffset new_window) {
   if (flow_controller_.UpdateSendWindowOffset(new_window)) {
     OnCanWrite();
   }
 }
 
 }  // namespace net