Revert of Allow ObserverListThreadSafe to be used from sequenced tasks.

base/android/application_status_listener_unittest.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/android/application_status_listener.h"
 
 #include <memory>
 
 #include "base/bind.h"
 #include "base/callback_forward.h"
@@ skipping 51 matching lines @@
     ApplicationStatusListener::NotifyApplicationStateChange(
         APPLICATION_STATE_HAS_RUNNING_ACTIVITIES);
     event_.Wait();
     EXPECT_EQ(APPLICATION_STATE_HAS_RUNNING_ACTIVITIES, state_);
 
     // Again
     ApplicationStatusListener::NotifyApplicationStateChange(
         APPLICATION_STATE_HAS_DESTROYED_ACTIVITIES);
     event_.Wait();
     EXPECT_EQ(APPLICATION_STATE_HAS_DESTROYED_ACTIVITIES, state_);
-
-    // Delete |listener_| on the thread on which it was created.
-    thread_.task_runner()->DeleteSoon(FROM_HERE, listener_.release());
   }
 
  private:
   void ExpectOnThread() {
     EXPECT_EQ(thread_.message_loop(), base::MessageLoop::current());
   }
 
   void RegisterThreadForEvents() {
     ExpectOnThread();
     listener_.reset(new ApplicationStatusListener(base::Bind(
@@ skipping 40 matching lines @@
   EXPECT_EQ(APPLICATION_STATE_HAS_DESTROYED_ACTIVITIES, result);
 }
 
 TEST(ApplicationStatusListenerTest, TwoThreads) {
   MultiThreadedTest test;
   test.Run();
 }
 
 }  // namespace android
 }  // namespace base