base: Remove the string logging from CHECK().

tools/gn/substitution_pattern.cc

Index: tools/gn/substitution_pattern.cc
diff --git a/tools/gn/substitution_pattern.cc b/tools/gn/substitution_pattern.cc
index c8e548998440e4814fc11f359ce0c6c922aeecec..c6f2ead23f5a4a9dfef560ecf0b1527d1b6a7fd0 100644
--- a/tools/gn/substitution_pattern.cc
+++ b/tools/gn/substitution_pattern.cc
@@ -100,7 +100,8 @@ bool SubstitutionPattern::Parse(const std::string& str,
 SubstitutionPattern SubstitutionPattern::MakeForTest(const char* str) {
   Err err;
   SubstitutionPattern pattern;
-  CHECK(pattern.Parse(str, nullptr, &err)) << err.message();
+  if (!pattern.Parse(str, nullptr, &err))
+    LOG(FATAL) << err.message();
   return pattern;
 }