Use unique_ptr<DictionaryValue> in ProxyConfigDictionary

chrome/browser/extensions/api/proxy/proxy_api_helpers.h

Index: chrome/browser/extensions/api/proxy/proxy_api_helpers.h
diff --git a/chrome/browser/extensions/api/proxy/proxy_api_helpers.h b/chrome/browser/extensions/api/proxy/proxy_api_helpers.h
index 26b9a9c6efbc7266939b92df4a2a1bfd0a9f6a5d..f7ee9a2b968e82d0e342aef2f5dcddc3e20813cf 100644
--- a/chrome/browser/extensions/api/proxy/proxy_api_helpers.h
+++ b/chrome/browser/extensions/api/proxy/proxy_api_helpers.h
@@ -7,6 +7,7 @@
 #ifndef CHROME_BROWSER_EXTENSIONS_API_PROXY_PROXY_API_HELPERS_H_
 #define CHROME_BROWSER_EXTENSIONS_API_PROXY_PROXY_API_HELPERS_H_
 
+#include <memory>
 #include <string>
 
 #include "components/proxy_config/proxy_prefs.h"
@@ -78,7 +79,7 @@ bool GetBypassListFromExtensionPref(const base::DictionaryValue* proxy_config,
 // Creates and returns a ProxyConfig dictionary (as defined in the extension
 // API) from the given parameters. Ownership is passed to the caller.
 // Depending on the value of |mode_enum|, several of the strings may be empty.
-base::DictionaryValue* CreateProxyConfigDict(
+std::unique_ptr<base::DictionaryValue> CreateProxyConfigDict(
     ProxyPrefs::ProxyMode mode_enum,
     bool pac_mandatory,
     const std::string& pac_url,