Update from https://crrev.com/320343

base/strings/string_split.cc

Index: base/strings/string_split.cc
diff --git a/base/strings/string_split.cc b/base/strings/string_split.cc
index 7ef4760c58f1500d3b807cbcd96bb526db292d45..692f3008e7827cf9b57a25a58d8e74509f92b373 100644
--- a/base/strings/string_split.cc
+++ b/base/strings/string_split.cc
@@ -138,9 +138,9 @@ 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);
 }
 
@@ -195,9 +195,9 @@ void SplitStringDontTrim(const std::string& str,
                          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);
 }