Expose Timer::AbandonAndStop, so it can safely be destroyed on another thread.

base/timer/timer.h

Index: base/timer/timer.h
diff --git a/base/timer/timer.h b/base/timer/timer.h
index 651ba39d9137d2a3814fe6859d6dce953aef994e..cd1fc5d122722c778c1700255cef91e55161cf0e 100644
--- a/base/timer/timer.h
+++ b/base/timer/timer.h
@@ -123,7 +123,7 @@ class BASE_EXPORT Timer {
                      const base::Closure& user_task);
 
   // Call this method to stop and cancel the timer.  It is a no-op if the timer
-  // is not running.
+  // is not running. Abandons any scheduled task.
   virtual void Stop();
 
   // Call this method to reset the timer delay. The |user_task_| must be set. If
@@ -166,14 +166,6 @@ class BASE_EXPORT Timer {
   // Called by BaseTimerTaskInternal when the delayed task fires.
   void RunScheduledTask();
 
-  // Stop running task (if any) and abandon scheduled task (if any).
-  void AbandonAndStop() {
-    AbandonScheduledTask();
-
-    Stop();
-    // No more member accesses here: |this| could be deleted at this point.
-  }
-
   // When non-null, the |scheduled_task_| was posted to call RunScheduledTask()
   // at |scheduled_run_time_|.
   BaseTimerTaskInternal* scheduled_task_;