headless: Only report protocol parsing errors when DCHECK is enabled

headless/public/util/error_reporter.cc

Index: headless/public/util/error_reporter.cc
diff --git a/headless/public/util/error_reporter.cc b/headless/public/util/error_reporter.cc
index 88722d7b79d035e071099fb0ea9520308e1d510e..9daa01986702f75868d188bc45e777615302d621 100644
--- a/headless/public/util/error_reporter.cc
+++ b/headless/public/util/error_reporter.cc
@@ -14,6 +14,7 @@ ErrorReporter::ErrorReporter() {}
 
 ErrorReporter::~ErrorReporter() {}
 
+#if DCHECK_IS_ON()
 void ErrorReporter::Push() {
   path_.push_back(nullptr);
 }
@@ -47,5 +48,6 @@ void ErrorReporter::AddError(base::StringPiece description) {
 bool ErrorReporter::HasErrors() const {
   return !errors_.empty();
 }
+#endif  // DCHECK_IS_ON()
 
 }  // namespace headless