Remove use of stl_util's STLDeleteContainerPairSecondPointers from content/.

content/browser/renderer_host/p2p/socket_host.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 "content/browser/renderer_host/p2p/socket_host.h"
 
 #include "base/metrics/histogram.h"
 #include "base/sys_byteorder.h"
 #include "content/browser/renderer_host/p2p/socket_host_tcp.h"
 #include "content/browser/renderer_host/p2p/socket_host_tcp_server.h"
@@ skipping 186 matching lines @@
       return new P2PSocketHostTcp(message_sender, socket_id, type, url_context);
 
     case P2P_SOCKET_STUN_TCP_CLIENT:
     case P2P_SOCKET_STUN_SSLTCP_CLIENT:
     case P2P_SOCKET_STUN_TLS_CLIENT:
       return new P2PSocketHostStunTcp(
           message_sender, socket_id, type, url_context);
   }
 
   NOTREACHED();
-  return NULL;
+  return nullptr;
 }
 
 void P2PSocketHost::StartRtpDump(
     bool incoming,
     bool outgoing,
     const RenderProcessHost::WebRtcRtpPacketCallback& packet_callback) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
   DCHECK(!packet_callback.is_null());
   DCHECK(incoming || outgoing);
 
@@ skipping 96 matching lines @@
     send_bytes_delayed_max_ = send_bytes_delayed_cur_;
   }
 }
 
 void P2PSocketHost::DecrementDelayedBytes(uint32_t size) {
   send_bytes_delayed_cur_ -= size;
   DCHECK_GE(send_bytes_delayed_cur_, 0);
 }
 
 }  // namespace content