DevTools: Extract target discovery and manipulation from DevToolsHttpHandlerImpl

content/shell/browser/shell_devtools_frontend.cc

 // Copyright 2013 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/shell/browser/shell_devtools_frontend.h"
 
 #include "base/command_line.h"
 #include "base/path_service.h"
 #include "content/public/browser/devtools_http_handler.h"
 #include "content/public/browser/devtools_manager.h"
@@ skipping 43 matching lines @@
   ShellDevToolsFrontend* devtools_frontend = new ShellDevToolsFrontend(
       shell,
       DevToolsAgentHost::GetOrCreateFor(inspected_contents->GetRenderViewHost())
           .get());
 
   ShellDevToolsDelegate* delegate = ShellContentBrowserClient::Get()->
       shell_browser_main_parts()->devtools_delegate();
   if (CommandLine::ForCurrentProcess()->HasSwitch(switches::kDumpRenderTree))
     shell->LoadURL(GetDevToolsPathAsURL());
   else
-    shell->LoadURL(delegate->devtools_http_handler()->GetFrontendURL(NULL));
+    shell->LoadURL(delegate->devtools_http_handler()->GetFrontendURL());
 
   return devtools_frontend;
 }
 
 void ShellDevToolsFrontend::Focus() {
   web_contents()->GetView()->Focus();
 }
 
 void ShellDevToolsFrontend::Close() {
   frontend_shell_->Close();
@@ skipping 23 matching lines @@
 void ShellDevToolsFrontend::WebContentsDestroyed(WebContents* web_contents) {
   DevToolsManager::GetInstance()->ClientHostClosing(frontend_host_.get());
   delete this;
 }
 
 void ShellDevToolsFrontend::InspectedContentsClosing() {
   frontend_shell_->Close();
 }
 
 }  // namespace content