[inspector_protocol] remove old style domains support

lib/ErrorSupport_cpp.template

 // 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 "ErrorSupport.h"
 
 {% for namespace in config.protocol.namespace %}
 namespace {{namespace}} {
 {% endfor %}
 
-ErrorSupport::ErrorSupport() : m_errorString(nullptr) { }
-ErrorSupport::ErrorSupport(String* errorString) : m_errorString(errorString) { }
-ErrorSupport::~ErrorSupport()
-{
-    if (m_errorString && hasErrors()) {
-        StringBuilder builder;
-        builder.append("Internal error(s): ");
-        builder.append(errors());
-        *m_errorString = builder.toString();
-    }
-}
+ErrorSupport::ErrorSupport() { }
+ErrorSupport::~ErrorSupport() { }
 
 void ErrorSupport::setName(const String& name)
 {
     DCHECK(m_path.size());
     m_path[m_path.size() - 1] = name;
 }
 
 void ErrorSupport::push()
 {
     m_path.push_back(String());
@@ skipping 29 matching lines @@
         if (i)
             builder.append("; ");
         builder.append(m_errors[i]);
     }
     return builder.toString();
 }
 
 {% for namespace in config.protocol.namespace %}
 } // namespace {{namespace}}
 {% endfor %}