Replace NULL with nullptr or null in webrtc/base/.

webrtc/base/flags.h

 /*
  *  Copyright 2006 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 171 matching lines @@
 #define DECLARE_int(name)  DECLARE_FLAG(int, name)
 #define DECLARE_float(name)  DECLARE_FLAG(double, name)
 #define DECLARE_string(name)  DECLARE_FLAG(const char*, name)
 
 
 // The global list of all flags.
 class FlagList {
  public:
   FlagList();
 
-  // The NULL-terminated list of all flags. Traverse with Flag::next().
+  // The null-terminated list of all flags. Traverse with Flag::next().
   static Flag* list()  { return list_; }
 
-  // If file != NULL, prints information for all flags defined in file;
-  // otherwise prints information for all flags in all files. The current
-  // flag value is only printed if print_current_value is set.
+  // If file != nullptr, prints information for all flags defined in file;
+  // otherwise prints information for all flags in all files. The current flag
+  // value is only printed if print_current_value is set.
   static void Print(const char* file, bool print_current_value);
 
-  // Lookup a flag by name. Returns the matching flag or NULL.
+  // Lookup a flag by name. Returns the matching flag or null.
   static Flag* Lookup(const char* name);
 
   // Helper function to parse flags: Takes an argument arg and splits it into
-  // a flag name and flag value (or NULL if they are missing). is_bool is set
+  // a flag name and flag value (or null if they are missing). is_bool is set
   // if the arg started with "-no" or "--no". The buffer may be used to NUL-
   // terminate the name, it must be large enough to hold any possible name.
   static void SplitArgument(const char* arg,
                             char* buffer, int buffer_size,
                             const char** name, const char** value,
                             bool* is_bool);
 
   // Set the flag values by parsing the command line. If remove_flags
   // is set, the flags and associated values are removed from (argc,
   // argv). Returns 0 if no error occurred. Otherwise, returns the
@@ skipping 44 matching lines @@
   char **argv_;
 
  private:
   RTC_DISALLOW_COPY_AND_ASSIGN(WindowsCommandLineArguments);
 };
 #endif  // WEBRTC_WIN
 
 }  // namespace rtc
 
 #endif  // SHARED_COMMANDLINEFLAGS_FLAGS_H__