Remove some uses of stl_util's STLDeleteContainerPointers.

content/public/test/test_navigation_observer.h

 // Copyright (c) 2012 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.
 
 #ifndef CONTENT_PUBLIC_TEST_TEST_NAVIGATION_OBSERVER_H_
 #define CONTENT_PUBLIC_TEST_TEST_NAVIGATION_OBSERVER_H_
 
 #include <memory>
 #include <set>
 
@@ skipping 79 matching lines @@
   // True if the last navigation succeeded.
   bool last_navigation_succeeded_;
 
   // The MessageLoopRunner used to spin the message loop.
   scoped_refptr<MessageLoopRunner> message_loop_runner_;
 
   // Callback invoked on WebContents creation.
   base::Callback<void(WebContents*)> web_contents_created_callback_;
 
   // Living TestWebContentsObservers created by this observer.
-  std::set<TestWebContentsObserver*> web_contents_observers_;
+  std::set<std::unique_ptr<TestWebContentsObserver>> web_contents_observers_;
 
   DISALLOW_COPY_AND_ASSIGN(TestNavigationObserver);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_TEST_TEST_NAVIGATION_OBSERVER_H_