Introduce SerializeDictionaryForest for devtools_target_ui

chrome/browser/devtools/devtools_targets_ui.h

 // 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.
 
 #ifndef CHROME_BROWSER_DEVTOOLS_DEVTOOLS_TARGETS_UI_H_
 #define CHROME_BROWSER_DEVTOOLS_DEVTOOLS_TARGETS_UI_H_
 
 #include <map>
 #include <memory>
 #include <string>
@@ skipping 32 matching lines @@
 
   virtual void Open(const std::string& browser_id, const std::string& url);
 
   virtual scoped_refptr<content::DevToolsAgentHost> GetBrowserAgentHost(
       const std::string& browser_id);
 
   virtual void ForceUpdate();
 
  protected:
   std::unique_ptr<base::DictionaryValue> Serialize(
-      scoped_refptr<content::DevToolsAgentHost> host);
+      content::DevToolsAgentHost* host);
   void SendSerializedTargets(const base::ListValue& list);
 
   using TargetMap =
       std::map<std::string, scoped_refptr<content::DevToolsAgentHost>>;
   TargetMap targets_;
 
  private:
   const std::string source_id_;
   Callback callback_;
 
   DISALLOW_COPY_AND_ASSIGN(DevToolsTargetsUIHandler);
 };
 
 class PortForwardingStatusSerializer
     : private DevToolsAndroidBridge::PortForwardingListener {
  public:
   typedef base::Callback<void(const base::Value&)> Callback;
 
   PortForwardingStatusSerializer(const Callback& callback, Profile* profile);
   ~PortForwardingStatusSerializer() override;
 
   void PortStatusChanged(const ForwardingStatus& status) override;
 
  private:
   Callback callback_;
   Profile* profile_;
 };
 
 #endif  // CHROME_BROWSER_DEVTOOLS_DEVTOOLS_TARGETS_UI_H_