Remove ListValue::Append(new {Fundamental,String}Value(...)) pattern in //extensions

extensions/common/extension_set_unittest.cc

Index: extensions/common/extension_set_unittest.cc
diff --git a/extensions/common/extension_set_unittest.cc b/extensions/common/extension_set_unittest.cc
index 967fadbe23e30c848f427d9ce2c5d5240a8b134e..83b598b4f05c94f3889e8ae3d3c0719e461827f0 100644
--- a/extensions/common/extension_set_unittest.cc
+++ b/extensions/common/extension_set_unittest.cc
@@ -38,7 +38,7 @@ scoped_refptr<Extension> CreateTestExtension(const std::string& name,
   if (!extent.empty()) {
     base::ListValue* urls = new base::ListValue();
     manifest.Set("app.urls", urls);
-    urls->Append(new base::StringValue(extent));
+    urls->AppendString(extent);
   }
 
   std::string error;