Removes MessageLoop::TYPE_XXX where possible

ui/message_center/message_center_impl_unittest.cc

Index: ui/message_center/message_center_impl_unittest.cc
diff --git a/ui/message_center/message_center_impl_unittest.cc b/ui/message_center/message_center_impl_unittest.cc
index e97c6f8eebdec03b541ec8f92bb1644a89c4b84e..1e8ab41f29cd395d8adaffbd6927cd60dd5e5d79 100644
--- a/ui/message_center/message_center_impl_unittest.cc
+++ b/ui/message_center/message_center_impl_unittest.cc
@@ -29,7 +29,7 @@ class MessageCenterImplTest : public testing::Test,
   virtual void SetUp() OVERRIDE {
     MessageCenter::Initialize();
     message_center_ = MessageCenter::Get();
-    loop_.reset(new base::MessageLoop(base::MessageLoop::TYPE_DEFAULT));
+    loop_.reset(new base::MessageLoop);
     run_loop_.reset(new base::RunLoop());
     closure_ = run_loop_->QuitClosure();
   }