[headless] Remove default browser context.

headless/lib/browser/headless_devtools.h

 // Copyright 2015 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.
 
 #ifndef HEADLESS_LIB_BROWSER_HEADLESS_DEVTOOLS_H_
 #define HEADLESS_LIB_BROWSER_HEADLESS_DEVTOOLS_H_
 
 #include <memory>
 
+#include "headless/public/headless_browser.h"
+
 namespace devtools_http_handler {
 class DevToolsHttpHandler;
 }
 
 namespace headless {
-class HeadlessBrowserContextImpl;
 
 // Starts a DevTools HTTP handler on the loopback interface on the port
 // configured by HeadlessBrowser::Options.
 std::unique_ptr<devtools_http_handler::DevToolsHttpHandler>
-CreateLocalDevToolsHttpHandler(HeadlessBrowserContextImpl* browser_context);
+CreateLocalDevToolsHttpHandler(HeadlessBrowser::Options* options);
 
-}  // namespace content
+}  // namespace headless
 
 #endif  // HEADLESS_LIB_BROWSER_HEADLESS_DEVTOOLS_H_