Introduce dchecked_cast, and start using it

webrtc/modules/audio_coding/neteq/red_payload_splitter.cc

 /*
  *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 92 matching lines @@
           LOG(LS_WARNING) << "SplitRed length mismatch";
           ret = false;
           break;
         }
 
         Packet new_packet;
         new_packet.timestamp = new_header.timestamp;
         new_packet.payload_type = new_header.payload_type;
         new_packet.sequence_number = red_packet.sequence_number;
         new_packet.priority.red_level =
-            rtc::checked_cast<int>((new_headers.size() - 1) - i);
+            rtc::dchecked_cast<int>((new_headers.size() - 1) - i);
         new_packet.payload.SetData(payload_ptr, payload_length);
         new_packets.push_front(std::move(new_packet));
         payload_ptr += payload_length;
       }
       // Insert new packets into original list, before the element pointed to by
       // iterator |it|.
       packet_list->splice(it, std::move(new_packets));
     } else {
       LOG(LS_WARNING) << "SplitRed too many blocks: " << new_headers.size();
       ret = false;
@@ skipping 29 matching lines @@
           continue;
         }
       }
     }
     ++it;
   }
   return num_deleted_packets;
 }
 
 }  // namespace webrtc