headless: Only report protocol parsing errors when DCHECK is enabled

headless/public/util/error_reporter.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "headless/public/util/error_reporter.h"
 
 #include <sstream>
 
 #include "base/logging.h"
 
 namespace headless {
 
 ErrorReporter::ErrorReporter() {}
 
 ErrorReporter::~ErrorReporter() {}
 
+#if DCHECK_IS_ON()
 void ErrorReporter::Push() {
   path_.push_back(nullptr);
 }
 
 void ErrorReporter::Pop() {
   path_.pop_back();
 }
 
 void ErrorReporter::SetName(const char* name) {
   DCHECK(!path_.empty());
@@ skipping 13 matching lines @@
   }
   if (error.tellp())
     error << ": ";
   error << description;
   errors_.push_back(error.str());
 }
 
 bool ErrorReporter::HasErrors() const {
   return !errors_.empty();
 }
+#endif  // DCHECK_IS_ON()
 
 }  // namespace headless