Replace NULL with nullptr in all C++ files.

webrtc/tools/frame_editing/frame_editing.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 64 matching lines @@
   parser.SetFlag("help", "false");
 
   parser.ProcessFlags();
   if (parser.GetFlag("help") == "true") {
     parser.PrintUsageMessage();
     exit(EXIT_SUCCESS);
   }
   parser.PrintEnteredFlags();
 
   const char* in_path = parser.GetFlag("in_path").c_str();
-  int width = strtol((parser.GetFlag("width")).c_str(), NULL, 10);
-  int height = strtol((parser.GetFlag("height")).c_str(), NULL, 10);
-  int first_frame_to_cut = strtol((parser.GetFlag("f")).c_str(), NULL, 10);
-  int interval = strtol((parser.GetFlag("interval")).c_str(), NULL, 10);
-  int last_frame_to_cut = strtol((parser.GetFlag("l")).c_str(), NULL, 10);
+  int width = strtol((parser.GetFlag("width")).c_str(), nullptr, 10);
+  int height = strtol((parser.GetFlag("height")).c_str(), nullptr, 10);
+  int first_frame_to_cut = strtol((parser.GetFlag("f")).c_str(), nullptr, 10);
+  int interval = strtol((parser.GetFlag("interval")).c_str(), nullptr, 10);
+  int last_frame_to_cut = strtol((parser.GetFlag("l")).c_str(), nullptr, 10);
 
   const char* out_path = parser.GetFlag("out_path").c_str();
 
   if (!strcmp(in_path, "-1")) {
     fprintf(stderr, "You must specify a file to edit\n");
     return -1;
   }
 
   if (first_frame_to_cut <= 0 || last_frame_to_cut <= 0) {
     fprintf(stderr, "Error: You must specify which frames to cut!\n");
     return -2;
   }
 
   if (width <= 0 || height <= 0) {
     fprintf(stderr, "Error: width or height cannot be <= 0!\n");
     return -3;
   }
   return webrtc::EditFrames(in_path, width, height, first_frame_to_cut,
                             interval, last_frame_to_cut, out_path);
 }