Make core/editing/ files to match Blink coding style

Source/core/editing/SmartReplaceICU.cpp

 /*
  * Copyright (C) 2007 Apple Inc.  All rights reserved.
  * Copyright (C) 2008 Tony Chang <idealisms@gmail.com>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 29 matching lines @@
 static void addAllCodePoints(USet* smartSet, const String& string)
 {
     for (size_t i = 0; i < string.length(); i++)
         uset_add(smartSet, string[i]);
 }
 
 // This is mostly a port of the code in WebCore/editing/SmartReplaceCF.cpp
 // except we use icu in place of CoreFoundations character classes.
 static USet* getSmartSet(bool isPreviousCharacter)
 {
-    static USet* preSmartSet = NULL;
-    static USet* postSmartSet = NULL;
+    static USet* preSmartSet = nullptr;
+    static USet* postSmartSet = nullptr;
     USet* smartSet = isPreviousCharacter ? preSmartSet : postSmartSet;
     if (!smartSet) {
         // Whitespace and newline (kCFCharacterSetWhitespaceAndNewline)
         UErrorCode ec = U_ZERO_ERROR;
         String whitespaceAndNewline("[[:WSpace:] [\\u000A\\u000B\\u000C\\u000D\\u0085]]");
         smartSet = uset_openPattern(whitespaceAndNewline.charactersWithNullTermination().data(), whitespaceAndNewline.length(), &ec);
         ASSERT(U_SUCCESS(ec));
 
         // CJK ranges
         uset_addRange(smartSet, 0x1100, 0x1100 + 256); // Hangul Jamo (0x1100 - 0x11FF)
@@ skipping 28 matching lines @@
 }
 
 bool isCharacterSmartReplaceExempt(UChar32 c, bool isPreviousCharacter)
 {
     return uset_contains(getSmartSet(isPreviousCharacter), c);
 }
 
 }
 
 #endif // !USE(CF)