Remove the most obvious dead code from message center.

ash/system/web_notification/web_notification_tray.cc

Index: ash/system/web_notification/web_notification_tray.cc
diff --git a/ash/system/web_notification/web_notification_tray.cc b/ash/system/web_notification/web_notification_tray.cc
index 7569509bfdf2872744c1fd70a2e7ffb75ce64032..2a5405370d676f2e9d3ea132ef96b675160decf0 100644
--- a/ash/system/web_notification/web_notification_tray.cc
+++ b/ash/system/web_notification/web_notification_tray.cc
@@ -29,7 +29,6 @@
 #include "ui/message_center/message_center_util.h"
 #include "ui/message_center/views/message_bubble_base.h"
 #include "ui/message_center/views/message_center_bubble.h"
-#include "ui/message_center/views/message_popup_bubble.h"
 #include "ui/message_center/views/message_popup_collection.h"
 #include "ui/views/bubble/tray_bubble_view.h"
 #include "ui/views/controls/button/custom_button.h"
@@ -272,21 +271,14 @@ bool WebNotificationTray::ShowPopups() {
       !status_area_widget()->ShouldShowWebNotifications()) {
     return false;
   }
-  if (message_center::IsRichNotificationEnabled()) {
-    // No bubble wrappers here, since |popup_collection_| is not a bubble but a
-    // collection of widgets.
-    popup_collection_.reset(new message_center::MessagePopupCollection(
-        ash::Shell::GetContainer(
-            GetWidget()->GetNativeView()->GetRootWindow(),
-            internal::kShellWindowId_StatusContainer),
-        message_center(),
-        message_center_tray_.get()));
-  } else {
-    message_center::MessagePopupBubble* popup_bubble =
-        new message_center::MessagePopupBubble(message_center());
-    popup_bubble_.reset(new internal::WebNotificationBubbleWrapper(
-        this, popup_bubble));
-  }
+
+  popup_collection_.reset(new message_center::MessagePopupCollection(
+      ash::Shell::GetContainer(
+          GetWidget()->GetNativeView()->GetRootWindow(),
+          internal::kShellWindowId_StatusContainer),
+      message_center(),
+      message_center_tray_.get()));
+
   return true;
 }
 
@@ -531,12 +523,4 @@ WebNotificationTray::GetMessageCenterBubbleForTest() {
       message_center_bubble()->bubble());
 }
 
-message_center::MessagePopupBubble*
-WebNotificationTray::GetPopupBubbleForTest() {
-  if (!popup_bubble())
-    return NULL;
-  return static_cast<message_center::MessagePopupBubble*>(
-      popup_bubble()->bubble());
-}
-
 }  // namespace ash