Rewrite scoped_ptr<T>(NULL) to use the default ctor in chrome/.

chrome/browser/background/background_application_list_model.cc

Index: chrome/browser/background/background_application_list_model.cc
diff --git a/chrome/browser/background/background_application_list_model.cc b/chrome/browser/background/background_application_list_model.cc
index ffd372ad40d304cb98417a244fdfc5334fcef328..f16a3a649aea2ea7105ac0267f63f3788835b06a 100644
--- a/chrome/browser/background/background_application_list_model.cc
+++ b/chrome/browser/background/background_application_list_model.cc
@@ -139,10 +139,7 @@ BackgroundApplicationListModel::Application::~Application() {
 BackgroundApplicationListModel::Application::Application(
     BackgroundApplicationListModel* model,
     const Extension* extension)
-    : extension_(extension),
-      icon_(NULL),
-      model_(model) {
-}
+    : extension_(extension), model_(model) {}
 
 void BackgroundApplicationListModel::Application::OnImageLoaded(
     const gfx::Image& image) {