Coverity: Initialize member variables.

net/http/http_response_body_drainer.cc

 // Copyright (c) 2011 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/http/http_response_body_drainer.h"
 
 #include "base/compiler_specific.h"
 #include "base/logging.h"
 #include "net/base/io_buffer.h"
 #include "net/base/net_errors.h"
 #include "net/http/http_network_session.h"
 #include "net/http/http_stream.h"
 
 namespace net {
 
 HttpResponseBodyDrainer::HttpResponseBodyDrainer(HttpStream* stream)
-    : stream_(stream),
+    : read_size_(0),
+      stream_(stream),
       next_state_(STATE_NONE),
       total_read_(0),
       session_(NULL) {}
 
 HttpResponseBodyDrainer::~HttpResponseBodyDrainer() {}
 
 void HttpResponseBodyDrainer::Start(HttpNetworkSession* session) {
   StartWithSize(session, kDrainBodyBufferSize);
 }
 
@@ skipping 106 matching lines @@
     stream_->Close(true /* no keep-alive */);
   } else {
     DCHECK_EQ(OK, result);
     stream_->Close(false /* keep-alive */);
   }
 
   delete this;
 }
 
 }  // namespace net