Fix value_cleanup to handle cases where arg_expr is a macro.

tools/clang/value_cleanup/tests/list-value-append-original.cc

Index: tools/clang/value_cleanup/tests/list-value-append-original.cc
diff --git a/tools/clang/value_cleanup/tests/list-value-append-original.cc b/tools/clang/value_cleanup/tests/list-value-append-original.cc
index 398fddca5fb390e6ecb9c69b2db26eb2cf42245a..02d74b937ca54adbb23dee71b163fae5fb73ba8a 100644
--- a/tools/clang/value_cleanup/tests/list-value-append-original.cc
+++ b/tools/clang/value_cleanup/tests/list-value-append-original.cc
@@ -4,9 +4,12 @@
 
 #include "base/values.h"
 
+#define true true
+
 void F() {
   base::ListValue list;
   list.Append(new base::FundamentalValue(1 == 0));
+  list.Append(new base::FundamentalValue(true));
   list.Append(new base::FundamentalValue(static_cast<unsigned char>(1.0)));
   list.Append(new base::FundamentalValue(double{3}));
   list.Append(new base::StringValue("abc"));