Some linked_ptr -> unique_ptr conversion in extensions/browser.

extensions/browser/lazy_background_task_queue.h

Index: extensions/browser/lazy_background_task_queue.h
diff --git a/extensions/browser/lazy_background_task_queue.h b/extensions/browser/lazy_background_task_queue.h
index 6aeecb859cdef76b78005e6f6ee097d1a1d2aace..1840cc8b92725a103ff83fce6620c86ba588fce7 100644
--- a/extensions/browser/lazy_background_task_queue.h
+++ b/extensions/browser/lazy_background_task_queue.h
@@ -13,7 +13,6 @@
 #include "base/callback_forward.h"
 #include "base/compiler_specific.h"
 #include "base/gtest_prod_util.h"
-#include "base/memory/linked_ptr.h"
 #include "base/scoped_observer.h"
 #include "components/keyed_service/core/keyed_service.h"
 #include "content/public/browser/notification_observer.h"
@@ -76,8 +75,8 @@ class LazyBackgroundTaskQueue : public KeyedService,
   typedef std::string ExtensionID;
   typedef std::pair<content::BrowserContext*, ExtensionID> PendingTasksKey;
   typedef std::vector<PendingTask> PendingTasksList;
-  typedef std::map<PendingTasksKey,
-                   linked_ptr<PendingTasksList> > PendingTasksMap;
+  using PendingTasksMap =
+      std::map<PendingTasksKey, std::unique_ptr<PendingTasksList>>;
 
   // content::NotificationObserver interface.
   void Observe(int type,