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

webrtc/base/macutils.cc

 /*
  *  Copyright 2007 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.
  */
 
 #include <cstring>
 #include <memory>
 #include <sstream>
 
 #include <sys/utsname.h>
 
 #include "webrtc/base/checks.h"
 #include "webrtc/base/logging.h"
 #include "webrtc/base/macutils.h"
 #include "webrtc/base/stringutils.h"
 
 namespace rtc {
 
 ///////////////////////////////////////////////////////////////////////////////
 
 bool ToUtf8(const CFStringRef str16, std::string* str8) {
-  if ((NULL == str16) || (NULL == str8)) {
+  if ((nullptr == str16) || (nullptr == str8)) {
     return false;
   }
   size_t maxlen = CFStringGetMaximumSizeForEncoding(CFStringGetLength(str16),
                                                     kCFStringEncodingUTF8) + 1;
   std::unique_ptr<char[]> buffer(new char[maxlen]);
   if (!buffer || !CFStringGetCString(str16, buffer.get(), maxlen,
                                      kCFStringEncodingUTF8)) {
     return false;
   }
   str8->assign(buffer.get());
   return true;
 }
 
 bool ToUtf16(const std::string& str8, CFStringRef* str16) {
-  if (NULL == str16) {
+  if (nullptr == str16) {
     return false;
   }
   *str16 = CFStringCreateWithBytes(kCFAllocatorDefault,
                                    reinterpret_cast<const UInt8*>(str8.data()),
                                    str8.length(), kCFStringEncodingUTF8,
                                    false);
-  return NULL != *str16;
+  return nullptr != *str16;
 }
 
 void DecodeFourChar(UInt32 fc, std::string* out) {
   std::stringstream ss;
   ss << '\'';
   bool printable = true;
   for (int i = 3; i >= 0; --i) {
     char ch = (fc >> (8 * i)) & 0xFF;
     if (isprint(static_cast<unsigned char>(ch))) {
       ss << ch;
@@ skipping 56 matching lines @@
     case 7:
       return kMacOSLion;
     case 8:
       return kMacOSMountainLion;
     case 9:
       return kMacOSMavericks;
   }
   return kMacOSNewer;
 }
 }  // namespace rtc