Notificaitons refactor step 2

ui/message_center/message_simple_view.cc

Index: ui/message_center/message_simple_view.cc
diff --git a/ui/message_center/message_simple_view.cc b/ui/message_center/message_simple_view.cc
index 94e138422cba77b351aeef4ea3736a9dea1dc648..76e6abe367cd634291b74d7ffb05f811ce8bc4df 100644
--- a/ui/message_center/message_simple_view.cc
+++ b/ui/message_center/message_simple_view.cc
@@ -22,7 +22,7 @@ const SkColor kNotificationReadColor = SkColorSetRGB(0xfa, 0xfa, 0xfa);
 
 MessageSimpleView::MessageSimpleView(
     NotificationList::Delegate* list_delegate,
-    const Notification& notification)
+    Notification* notification)
     : MessageView(list_delegate, notification) {
   views::ImageButton* close = new views::ImageButton(this);
   close->SetImage(
@@ -63,16 +63,16 @@ void MessageSimpleView::SetUpView() {
   views::ImageView* icon = new views::ImageView;
   icon->SetImageSize(
       gfx::Size(kWebNotificationIconSize, kWebNotificationIconSize));
-  icon->SetImage(notification().primary_icon);
+  icon->SetImage(notification()->primary_icon());
 
-  views::Label* title = new views::Label(notification().title);
+  views::Label* title = new views::Label(notification()->title());
   title->SetHorizontalAlignment(gfx::ALIGN_LEFT);
   title->SetFont(title->font().DeriveFont(0, gfx::Font::BOLD));
-  views::Label* message = new views::Label(notification().message);
+  views::Label* message = new views::Label(notification()->message());
   message->SetHorizontalAlignment(gfx::ALIGN_LEFT);
   message->SetMultiLine(true);
 
-  SkColor bg_color = notification().is_read ?
+  SkColor bg_color = notification()->is_read() ?
       kNotificationReadColor : kNotificationColor;
   content_view_.reset(new views::View);
   content_view_->set_background(