Add explicit != nullptr check in quic_session. No behavior change.

net/quic/core/quic_session.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/quic_session.h"
 
 #include "base/memory/ptr_util.h"
 #include "base/stl_util.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/stringprintf.h"
@@ skipping 141 matching lines @@
   if (stream_id == kConnectionLevelId) {
     // This is a window update that applies to the connection, rather than an
     // individual stream.
     DVLOG(1) << ENDPOINT << "Received connection level flow control window "
                             "update with byte offset: "
              << frame.byte_offset;
     flow_controller_.UpdateSendWindowOffset(frame.byte_offset);
     return;
   }
   ReliableQuicStream* stream = GetOrCreateStream(stream_id);
-  if (stream) {
+  if (stream != nullptr) {
     stream->OnWindowUpdateFrame(frame);
   }
 }
 
 void QuicSession::OnBlockedFrame(const QuicBlockedFrame& frame) {
   // TODO(rjshade): Compare our flow control receive windows for specified
   //                streams: if we have a large window then maybe something
   //                had gone wrong with the flow control accounting.
   DVLOG(1) << ENDPOINT
            << "Received BLOCKED frame with stream id: " << frame.stream_id;
@@ skipping 646 matching lines @@
 
 size_t QuicSession::MaxAvailableStreams() const {
   return max_open_incoming_streams_ * kMaxAvailableStreamsMultiplier;
 }
 
 bool QuicSession::IsIncomingStream(QuicStreamId id) const {
   return id % 2 != next_outgoing_stream_id_ % 2;
 }
 
 }  // namespace net