Add scoped_ptr-safe base::Value to Dictionary/List conversion functions.

extensions/utility/unpacker.h

Index: extensions/utility/unpacker.h
diff --git a/extensions/utility/unpacker.h b/extensions/utility/unpacker.h
index 7e5a7e47c75347b94e3aeac8e482c7c5f98a4040..eaffc7b4c6217bfa666094d68d9bfa2b26625bb9 100644
--- a/extensions/utility/unpacker.h
+++ b/extensions/utility/unpacker.h
@@ -55,8 +55,7 @@ class Unpacker {
   bool DumpMessageCatalogsToFile();
 
   // Parse the manifest.json file inside the extension (not in the header).
-  // Caller takes ownership of return value.
-  base::DictionaryValue* ReadManifest();
+  scoped_ptr<base::DictionaryValue> ReadManifest();
 
   // Parse all _locales/*/messages.json files inside the extension.
   bool ReadAllMessageCatalogs(const std::string& default_locale);