Remove linked_ptr usage in //base.

extensions/browser/guest_view/web_view/web_view_find_helper.h

 // 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.
 
 #ifndef EXTENSIONS_BROWSER_GUEST_VIEW_WEB_VIEW_WEB_VIEW_FIND_HELPER_H_
 #define EXTENSIONS_BROWSER_GUEST_VIEW_WEB_VIEW_WEB_VIEW_FIND_HELPER_H_
 
 #include <map>
 #include <vector>
 
 #include "base/macros.h"
+#include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "base/values.h"
 #include "content/public/browser/web_contents.h"
 #include "third_party/WebKit/public/web/WebFindOptions.h"
 #include "ui/gfx/geometry/rect.h"
 
 namespace extensions {
 class WebViewInternalFindFunction;
 class WebViewGuest;
 
@@ skipping 70 matching lines @@
     void PrepareResults(base::DictionaryValue* results);
 
    private:
     const base::string16 search_text_;
     FindResults find_results_;
 
     DISALLOW_COPY_AND_ASSIGN(FindUpdateEvent);
   };
 
   // Handles all information about a find request and its results.
-  class FindInfo {
+  class FindInfo : public base::RefCounted<FindInfo> {
    public:
     FindInfo(int request_id,
              const base::string16& search_text,
              const blink::WebFindOptions& options,
              scoped_refptr<WebViewInternalFindFunction> find_function);
-    ~FindInfo();
 
     // Add another request to |find_next_requests_|.
     void AddFindNextRequest(const base::WeakPtr<FindInfo>& request) {
       find_next_requests_.push_back(request);
     }
 
     // Aggregate the find results.
     void AggregateResults(int number_of_matches,
                           const gfx::Rect& selection_rect,
                           int active_match_ordinal,
@@ skipping 15 matching lines @@
 
     const base::string16& search_text() {
       return search_text_;
     }
 
     // Calls the callback function within |find_function_| with the find results
     // from within |find_results_|.
     void SendResponse(bool canceled);
 
    private:
+    friend class base::RefCounted<FindInfo>;
+
+    ~FindInfo();
+
     const int request_id_;
     const base::string16 search_text_;
     blink::WebFindOptions options_;
     scoped_refptr<WebViewInternalFindFunction> find_function_;
     FindResults find_results_;
 
     // A find reply has been received for this find request.
     bool replied_;
 
     // Stores pointers to all the find next requests if this is the first
@@ skipping 11 matching lines @@
   // Pointer to the webview that is being helped.
   WebViewGuest* const webview_guest_;
 
   // A counter to generate a unique request id for a find request.
   // We only need the ids to be unique for a given WebViewGuest.
   int current_find_request_id_;
 
   // 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.
+  scoped_refptr<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_refptr<FindInfo>>;
   FindInfoMap find_info_map_;
 
   DISALLOW_COPY_AND_ASSIGN(WebViewFindHelper);
 };
 
 } // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_GUEST_VIEW_WEB_VIEW_WEB_VIEW_FIND_HELPER_H_