Remove use of stl_util's STLDeleteContainerPairSecondPointers from content/.

content/browser/renderer_host/p2p/socket_host_tcp_unittest.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_tcp.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <deque>
@@ skipping 20 matching lines @@
   }
 
   void SetUp() override {
     EXPECT_CALL(
         sender_,
         Send(MatchMessage(static_cast<uint32_t>(P2PMsg_OnSocketCreated::ID))))
         .WillOnce(DoAll(DeleteArg<0>(), Return(true)));
 
     if (socket_type_ == P2P_SOCKET_TCP_CLIENT) {
       socket_host_.reset(
-          new P2PSocketHostTcp(&sender_, 0, P2P_SOCKET_TCP_CLIENT, NULL));
+          new P2PSocketHostTcp(&sender_, 0, P2P_SOCKET_TCP_CLIENT, nullptr));
     } else {
       socket_host_.reset(new P2PSocketHostStunTcp(
-          &sender_, 0, P2P_SOCKET_STUN_TCP_CLIENT, NULL));
+          &sender_, 0, P2P_SOCKET_STUN_TCP_CLIENT, nullptr));
     }
 
     socket_ = new FakeSocket(&sent_data_);
     socket_->SetLocalAddress(ParseAddress(kTestLocalIpAddress, kTestPort1));
     socket_host_->socket_.reset(socket_);
 
     dest_.ip_address = ParseAddress(kTestIpAddress1, kTestPort1);
 
     local_address_ = ParseAddress(kTestLocalIpAddress, kTestPort1);
 
@@ skipping 341 matching lines @@
   base::RunLoop().RunUntilIdle();
 
   std::string expected_data;
   expected_data.append(packet1.begin(), packet1.end());
   expected_data.append(packet2.begin(), packet2.end());
 
   EXPECT_EQ(expected_data, sent_data_);
 }
 
 }  // namespace content