Replace NOTREACHED() with DCHECK(false) (fixes #3500)

Restores the old behavior of assertion in Debug build only.

libcef_dll/wrapper/cef_xml_object.cc

@@ -107,7 +107,7 @@ class CefXmlObjectLoader {
               cur_object->GetName() != reader->GetQualifiedName()) {
             // Open tag without close tag or close tag without open tag should
             // never occur (the parser catches this error).
-            NOTREACHED();
+            DCHECK(false);
             std::stringstream ss;
             ss << "Mismatched end tag for "
                << std::string(cur_object->GetName()) << ", line "