Use std::unique_ptr to express ownership of base::Value in PolicyMap::Entry

chrome/browser/chromeos/policy/configuration_policy_handler_chromeos.h

 // Copyright (c) 2012 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_CHROMEOS_POLICY_CONFIGURATION_POLICY_HANDLER_CHROMEOS_H_
 #define CHROME_BROWSER_CHROMEOS_POLICY_CONFIGURATION_POLICY_HANDLER_CHROMEOS_H_
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "chrome/browser/extensions/policy_handlers.h"
@@ skipping 47 matching lines @@
  private:
   explicit NetworkConfigurationPolicyHandler(
       const char* policy_name,
       ::onc::ONCSource onc_source,
       const char* pref_path);
 
   // Takes network policy in Value representation and produces an output Value
   // that contains a pretty-printed and sanitized version. In particular, we
   // remove any Passphrases that may be contained in the JSON. Ownership of the
   // return value is transferred to the caller.
-  static base::Value* SanitizeNetworkConfig(const base::Value* config);
+  static std::unique_ptr<base::Value> SanitizeNetworkConfig(
+      const base::Value* config);
 
   // The kind of ONC source that this handler represents. ONCSource
   // distinguishes between user and device policy.
   const ::onc::ONCSource onc_source_;
 
   // The name of the pref to apply the policy to.
   const char* pref_path_;
 
   DISALLOW_COPY_AND_ASSIGN(NetworkConfigurationPolicyHandler);
 };
@@ skipping 82 matching lines @@
   void ApplyPolicySettings(const PolicyMap& policies,
                            PrefValueMap* prefs) override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ScreenLockDelayPolicyHandler);
 };
 
 }  // namespace policy
 
 #endif  // CHROME_BROWSER_CHROMEOS_POLICY_CONFIGURATION_POLICY_HANDLER_CHROMEOS_H_