base: Remove the string logging from CHECK().

tools/gn/substitution_writer.cc

Index: tools/gn/substitution_writer.cc
diff --git a/tools/gn/substitution_writer.cc b/tools/gn/substitution_writer.cc
index 4d818cdaeac6a25d45de131d93618909ac5a3379..cd74a521094dd091e2d94754a031ae0a5c7b284f 100644
--- a/tools/gn/substitution_writer.cc
+++ b/tools/gn/substitution_writer.cc
@@ -169,15 +169,13 @@ void SubstitutionWriter::GetListAsSourceFiles(
     const SubstitutionList& list,
     std::vector<SourceFile>* output) {
   for (const auto& pattern : list.list()) {
-    CHECK(pattern.ranges().size() == 1 &&
-          pattern.ranges()[0].type == SUBSTITUTION_LITERAL)
-        << "The substitution pattern \""
-        << pattern.AsString()
+    LOG_IF(FATAL, pattern.ranges().size() != 1 ||
+                      pattern.ranges()[0].type != SUBSTITUTION_LITERAL)
+        << "The substitution pattern \"" << pattern.AsString()
         << "\" was expected to be a literal with no {{substitutions}}.";
     const std::string& literal = pattern.ranges()[0].literal;
-    CHECK(literal.size() >= 1 && literal[0] == '/')
-        << "The result of the pattern \""
-        << pattern.AsString()
+    LOG_IF(FATAL, literal.empty() || literal[0] != '/')
+        << "The result of the pattern \"" << pattern.AsString()
         << "\" was not an absolute path.";
     output->push_back(SourceFile(literal));
   }
@@ -201,9 +199,8 @@ SourceFile SubstitutionWriter::ApplyPatternToSource(
       const SourceFile& source) {
   std::string result_value = ApplyPatternToSourceAsString(
       settings, pattern, source);
-  CHECK(!result_value.empty() && result_value[0] == '/')
-      << "The result of the pattern \""
-      << pattern.AsString()
+  LOG_IF(FATAL, result_value.empty() || result_value[0] != '/')
+      << "The result of the pattern \"" << pattern.AsString()
       << "\" was not a path beginning in \"/\" or \"//\".";
   return SourceFile(SourceFile::SWAP_IN, &result_value);
 }