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/scoped_ptr.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 143 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.
+  base::WeakPtr<FindInfo> current_find_session_;

[dcheng, 2016/01/27 22:18:27]

An alternative is to make this a raw pointer, but that makes erasing from the
map more complicated. Since there are three different places in code that erase
from the map, and FindInfo already exposes itself as a WeakPtr, this seemed the
simplest.

 
   // 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);
 };
 
 } // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_GUEST_VIEW_WEB_VIEW_WEB_VIEW_FIND_HELPER_H_