Remove linked_ptr usage in //base.

extensions/browser/guest_view/web_view/web_view_find_helper.h

Index: extensions/browser/guest_view/web_view/web_view_find_helper.h
diff --git a/extensions/browser/guest_view/web_view/web_view_find_helper.h b/extensions/browser/guest_view/web_view/web_view_find_helper.h
index 0c622d0c089d1360048ec3184ad0bb8f7e95881d..3c2245d740a820749cb01c789547d65705b904b3 100644
--- a/extensions/browser/guest_view/web_view/web_view_find_helper.h
+++ b/extensions/browser/guest_view/web_view/web_view_find_helper.h
@@ -9,6 +9,7 @@
 #include <vector>
 
 #include "base/macros.h"
+#include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/values.h"
 #include "content/public/browser/web_contents.h"
@@ -172,12 +173,13 @@ class WebViewFindHelper {
   // Stores aggregated find results and other info for the |findupdate| event.
   scoped_ptr<FindUpdateEvent> find_update_event_;
 
-  // Pointer to the first request of the current find session.
-  linked_ptr<FindInfo> current_find_session_;
+  // Pointer to the first request of the current find session. find_info_map_
+  // retains ownership.
+  base::WeakPtr<FindInfo> current_find_session_;
 
   // Stores each find request's information by request_id so that its callback
   // function can be called when its find results are available.
-  typedef std::map<int, linked_ptr<FindInfo> > FindInfoMap;
+  using FindInfoMap = std::map<int, scoped_ptr<FindInfo>>;
   FindInfoMap find_info_map_;
 
   DISALLOW_COPY_AND_ASSIGN(WebViewFindHelper);