Update from https://crrev.com/320343

base/strings/string_split.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/strings/string_split.h"
 
 #include "base/logging.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/third_party/icu/icu_utf.h"
@@ skipping 120 matching lines @@
                  char16 c,
                  std::vector<string16>* r) {
   DCHECK(CBU16_IS_SINGLE(c));
   SplitStringT(str, c, true, r);
 }
 
 void SplitString(const std::string& str,
                  char c,
                  std::vector<std::string>* r) {
 #if CHAR_MIN < 0
-  DCHECK(c >= 0);
+  DCHECK_GE(c, 0);
 #endif
-  DCHECK(c < 0x7F);
+  DCHECK_LT(c, 0x7F);
   SplitStringT(str, c, true, r);
 }
 
 bool SplitStringIntoKeyValuePairs(const std::string& line,
                                   char key_value_delimiter,
                                   char key_value_pair_delimiter,
                                   StringPairs* key_value_pairs) {
   key_value_pairs->clear();
 
   std::vector<std::string> pairs;
@@ skipping 34 matching lines @@
                          std::vector<string16>* r) {
   DCHECK(CBU16_IS_SINGLE(c));
   SplitStringT(str, c, false, r);
 }
 
 void SplitStringDontTrim(const std::string& str,
                          char c,
                          std::vector<std::string>* r) {
   DCHECK(IsStringUTF8(str));
 #if CHAR_MIN < 0
-  DCHECK(c >= 0);
+  DCHECK_GE(c, 0);
 #endif
-  DCHECK(c < 0x7F);
+  DCHECK_LT(c, 0x7F);
   SplitStringT(str, c, false, r);
 }
 
 void SplitStringAlongWhitespace(const string16& str,
                                 std::vector<string16>* result) {
   SplitStringAlongWhitespaceT(str, result);
 }
 
 void SplitStringAlongWhitespace(const std::string& str,
                                 std::vector<std::string>* result) {
   SplitStringAlongWhitespaceT(str, result);
 }
 
 }  // namespace base