[headless] Remove default browser context.

headless/lib/browser/headless_content_browser_client.cc

 // 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.
 
 #include "headless/lib/browser/headless_content_browser_client.h"
 
 #include <memory>
 
 #include "base/memory/ptr_util.h"
 #include "content/public/browser/browser_thread.h"
@@ skipping 12 matching lines @@
 content::BrowserMainParts* HeadlessContentBrowserClient::CreateBrowserMainParts(
     const content::MainFunctionParams&) {
   std::unique_ptr<HeadlessBrowserMainParts> browser_main_parts =
       base::WrapUnique(new HeadlessBrowserMainParts(browser_));
   browser_->set_browser_main_parts(browser_main_parts.get());
   return browser_main_parts.release();
 }
 
 content::DevToolsManagerDelegate*
 HeadlessContentBrowserClient::GetDevToolsManagerDelegate() {
-  return new HeadlessDevToolsManagerDelegate(browser_);
+  std::unique_ptr<HeadlessDevToolsManagerDelegate> devtools_manager_delegate =
+      base::WrapUnique(new HeadlessDevToolsManagerDelegate(browser_));
+  browser_->set_devtools_manager_delegate(
+      devtools_manager_delegate->GetWeakPtr());
+  return devtools_manager_delegate.release();
 }
 
 }  // namespace headless