Convert //chrome/browser/extensions from scoped_ptr to std::unique_ptr

chrome/browser/extensions/convert_web_app.cc

Index: chrome/browser/extensions/convert_web_app.cc
diff --git a/chrome/browser/extensions/convert_web_app.cc b/chrome/browser/extensions/convert_web_app.cc
index f12ab4c0bade69529268fcd3e83908a863226c3c..9d6f46dec1bb2331f2f1ecc453e198403fa43629 100644
--- a/chrome/browser/extensions/convert_web_app.cc
+++ b/chrome/browser/extensions/convert_web_app.cc
@@ -102,7 +102,7 @@ scoped_refptr<Extension> ConvertWebAppToExtension(
   }
 
   // Create the manifest
-  scoped_ptr<base::DictionaryValue> root(new base::DictionaryValue);
+  std::unique_ptr<base::DictionaryValue> root(new base::DictionaryValue);
   root->SetString(keys::kPublicKey, GenerateKey(web_app.app_url));
   root->SetString(keys::kName, base::UTF16ToUTF8(web_app.title));
   root->SetString(keys::kVersion, ConvertTimeToExtensionVersion(create_time));