[DevTools] Rework RFDTAH navigation tracking with browser side navigation

content/browser/devtools/devtools_agent_host_impl.cc

 // Copyright (c) 2012 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 "content/browser/devtools/devtools_agent_host_impl.h"
 
 #include <map>
 #include <vector>
 
 #include "base/bind.h"
@@ skipping 393 matching lines @@
   if (chunk.is_last) {
     if (message_buffer_.size() != message_buffer_size_)
       return false;
     callback_.Run(chunk.session_id, message_buffer_);
     message_buffer_ = std::string();
     message_buffer_size_ = 0;
   }
   return true;
 }
 
+void DevToolsMessageChunkProcessor::Reset() {
+  message_buffer_ = std::string();
+  message_buffer_size_ = 0;
+  state_cookie_ = std::string();
+  last_call_id_ = 0;
+}
+
 }  // namespace content