base: Remove the string logging from CHECK().

tools/gn/test_with_scope.cc

Index: tools/gn/test_with_scope.cc
diff --git a/tools/gn/test_with_scope.cc b/tools/gn/test_with_scope.cc
index b239c640052da0610105d89e6b70df623be44860..1b1618e4f8d18a40cfcb05522226e35e830a8962 100644
--- a/tools/gn/test_with_scope.cc
+++ b/tools/gn/test_with_scope.cc
@@ -60,8 +60,8 @@ bool TestWithScope::ExecuteSnippet(const std::string& str, Err* err) {
     return false;
 
   for (size_t i = first_item; i < items_.size(); ++i) {
-    CHECK(items_[i]->AsTarget() != nullptr)
-        << "Only targets are supported in ExecuteSnippet()";
+    // Only targets are supported in ExecuteSnippet()
+    CHECK(items_[i]->AsTarget() != nullptr);
     items_[i]->AsTarget()->SetToolchain(&toolchain_);
     if (!items_[i]->OnResolved(err))
       return false;
@@ -190,8 +190,8 @@ void TestWithScope::SetCommandForTool(const std::string& cmd, Tool* tool) {
   Err err;
   SubstitutionPattern command;
   command.Parse(cmd, nullptr, &err);
-  CHECK(!err.has_error())
-      << "Couldn't parse \"" << cmd << "\", " << "got " << err.message();
+  LOG_IF(FATAL, err.has_error()) << "Couldn't parse \"" << cmd << "\", "
+                                 << "got " << err.message();
   tool->set_command(command);
 }