Remove deprecated ListValue::Append(Value*) overload on Linux.

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 31 matching lines @@
       const std::string& target_id);
 
   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:
-  base::DictionaryValue* Serialize(
+  std::unique_ptr<base::DictionaryValue> Serialize(
       scoped_refptr<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_;
@@ skipping 10 matching lines @@
   ~PortForwardingStatusSerializer() override;
 
   void PortStatusChanged(const ForwardingStatus& status) override;
 
  private:
   Callback callback_;
   Profile* profile_;
 };
 
 #endif  // CHROME_BROWSER_DEVTOOLS_DEVTOOLS_TARGETS_UI_H_