Remove raw base::DictionaryValue::Set in //extensions

extensions/browser/api/web_request/web_request_api_helpers.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.
 
 // Helper classes and functions used for the WebRequest API.
 
 #ifndef EXTENSIONS_BROWSER_API_WEB_REQUEST_WEB_REQUEST_API_HELPERS_H_
 #define EXTENSIONS_BROWSER_API_WEB_REQUEST_WEB_REQUEST_API_HELPERS_H_
 
 #include <list>
@@ skipping 185 matching lines @@
 };
 
 typedef std::list<linked_ptr<EventResponseDelta> > EventResponseDeltas;
 
 // Comparison operator that returns true if the extension that caused
 // |a| was installed after the extension that caused |b|.
 bool InDecreasingExtensionInstallationTimeOrder(
     const linked_ptr<EventResponseDelta>& a,
     const linked_ptr<EventResponseDelta>& b);
 
-// Converts a string to a list of integers, each in 0..255. Ownership
-// of the created list is passed to the caller.
-base::ListValue* StringToCharList(const std::string& s);
+// Converts a string to a list of integers, each in 0..255.
+std::unique_ptr<base::ListValue> StringToCharList(const std::string& s);
 
 // Converts a list of integer values between 0 and 255 into a string |*out|.
 // Returns true if the conversion was successful.
 bool CharListToString(const base::ListValue* list, std::string* out);
 
 // The following functions calculate and return the modifications to requests
 // commanded by extension handlers. All functions take the id of the extension
 // that commanded a modification, the installation time of this extension (used
 // for defining a precedence in conflicting modifications) and whether the
 // extension requested to |cancel| the request. Other parameters depend on a
@@ skipping 114 matching lines @@
 
 // Converts the |name|, |value| pair of a http header to a HttpHeaders
 // dictionary.
 std::unique_ptr<base::DictionaryValue> CreateHeaderDictionary(
     const std::string& name,
     const std::string& value);
 
 }  // namespace extension_web_request_api_helpers
 
 #endif  // EXTENSIONS_BROWSER_API_WEB_REQUEST_WEB_REQUEST_API_HELPERS_H_