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

extensions/common/file_util.h

Index: extensions/common/file_util.h
diff --git a/extensions/common/file_util.h b/extensions/common/file_util.h
index 015039e9e7c5996d00a362fcae45d2266502a944..5bb128746bbae3ffccfc582edc22b4c3b93c4dfe 100644
--- a/extensions/common/file_util.h
+++ b/extensions/common/file_util.h
@@ -59,11 +59,12 @@ scoped_refptr<Extension> LoadExtension(const base::FilePath& extension_root,
 
 // Loads an extension manifest from the specified directory. Returns NULL
 // on failure, with a description of the error in |error|.
-base::DictionaryValue* LoadManifest(const base::FilePath& extension_root,
-                                    std::string* error);
+scoped_ptr<base::DictionaryValue> LoadManifest(
+    const base::FilePath& extension_root,
+    std::string* error);
 
 // Convenience overload for specifying a manifest filename.
-base::DictionaryValue* LoadManifest(
+scoped_ptr<base::DictionaryValue> LoadManifest(
     const base::FilePath& extension_root,
     const base::FilePath::CharType* manifest_filename,
     std::string* error);