Remove linked_ptr from chrome/browser/ui/.

BUG=556939

Change-Id: I0bb5e64f47203e3f71f0bf8eef8eaa6c449ad7b0
Reviewed-on: https://chromium-review.googlesource.com/c/1357552
Commit-Queue: Sidney San Martín <sdy@chromium.org>
Reviewed-by: Sidney San Martín <sdy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#613111}

chrome/browser/ui/hung_plugin_tab_helper.cc

@@ -156,9 +156,9 @@ void HungPluginTabHelper::PluginHungStatusChanged(
       content::PluginService::GetInstance()->GetPluginDisplayNameByPath(
           plugin_path);
 
-  linked_ptr<PluginState> state(new PluginState(plugin_path, plugin_name));
-  hung_plugins_[plugin_child_id] = state;
-  ShowBar(plugin_child_id, state.get());
+  hung_plugins_[plugin_child_id] =
+      std::make_unique<PluginState>(plugin_path, plugin_name);
+  ShowBar(plugin_child_id, hung_plugins_[plugin_child_id].get());
 }
 
 void HungPluginTabHelper::OnInfoBarRemoved(infobars::InfoBar* infobar,

chrome/browser/ui/hung_plugin_tab_helper.h

@@ -6,9 +6,9 @@
 #define CHROME_BROWSER_UI_HUNG_PLUGIN_TAB_HELPER_H_
 
 #include <map>
+#include <memory>
 
 #include "base/macros.h"
-#include "base/memory/linked_ptr.h"
 #include "base/scoped_observer.h"
 #include "base/strings/string16.h"
 #include "base/time/time.h"
@@ -58,7 +58,6 @@ class HungPluginTabHelper
   friend class content::WebContentsUserData<HungPluginTabHelper>;
 
   struct PluginState;
-  typedef std::map<int, linked_ptr<PluginState> > PluginStateMap;
 
   explicit HungPluginTabHelper(content::WebContents* contents);
 
@@ -74,7 +73,7 @@ class HungPluginTabHelper
   void CloseBar(PluginState* state);
 
   // All currently hung plugins.
-  PluginStateMap hung_plugins_;
+  std::map<int, std::unique_ptr<PluginState>> hung_plugins_;
 
   ScopedObserver<infobars::InfoBarManager, infobars::InfoBarManager::Observer>
       infobar_observer_;