Reset popup dismissal timers when replacing a notification.

ui/message_center/popup_timer.h

Index: ui/message_center/popup_timer.h
diff --git a/ui/message_center/popup_timer.h b/ui/message_center/popup_timer.h
index fb3ef775f2f44cd3e23c300393bfe990a560a6c6..494e360b88b1e34ee11cf0bc87e1d99f8554722b 100644
--- a/ui/message_center/popup_timer.h
+++ b/ui/message_center/popup_timer.h
@@ -41,12 +41,6 @@ class PopupTimer {
   // subsequent calls to Start the timer will continue where it left off.
   void Pause();
 
-  // Stops the timer, and resets the amount of time that has passed so that
-  // calling Start results in a timeout equal to the initial timeout setting.
-  void Reset();
-
-  base::TimeDelta get_timeout() const { return timeout_; }
-
  private:
   // Notification ID for which this timer applies.
   const std::string id_;