[Devtools] Allow User-Agent header override for Websockets

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/guid.h"
@@ skipping 144 matching lines @@
 void DevToolsAgentHostImpl::SendProtocolResponse(int session_id,
                                                  const std::string& message) {
   SendMessageToClient(session_id, message);
 }
 
 void DevToolsAgentHostImpl::SendProtocolNotification(
     const std::string& message) {
   SendMessageToClient(session_id_, message);
 }
 
+std::string DevToolsAgentHostImpl::GetUserAgentOverride() {
+  return "";
+}
+
 void DevToolsAgentHostImpl::HostClosed() {
   if (!client_)
     return;
 
   scoped_refptr<DevToolsAgentHostImpl> protect(this);
   // Clear |client_| before notifying it.
   DevToolsAgentHostClient* client = client_;
   client_ = NULL;
   client->AgentHostClosed(this, false);
 }
@@ skipping 106 matching lines @@
 
   if (chunk.is_last) {
     CHECK(message_buffer_.size() == message_buffer_size_);
     callback_.Run(chunk.session_id, message_buffer_);
     message_buffer_ = std::string();
     message_buffer_size_ = 0;
   }
 }
 
 }  // namespace content