Keep event page alive when there's some Pepper plugin on it.

content/browser/web_contents/web_contents_impl.h

 // Copyright (c) 2012 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 CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_IMPL_H_
 #define CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_IMPL_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 808 matching lines @@
   void OnAppCacheAccessed(const GURL& manifest_url, bool blocked_by_policy);
   void OnOpenColorChooser(int color_chooser_id,
                           SkColor color,
                           const std::vector<ColorSuggestion>& suggestions);
   void OnEndColorChooser(int color_chooser_id);
   void OnSetSelectedColorInColorChooser(int color_chooser_id, SkColor color);
   void OnWebUISend(const GURL& source_url,
                    const std::string& name,
                    const base::ListValue& args);
 #if defined(ENABLE_PLUGINS)
+  void OnPepperInstanceCreated();
+  void OnPepperInstanceDeleted();
   void OnPepperPluginHung(int plugin_child_id,
                           const base::FilePath& path,
                           bool is_hung);
   void OnPluginCrashed(const base::FilePath& plugin_path,
                        base::ProcessId plugin_pid);
   void OnRequestPpapiBrokerPermission(int routing_id,
                                       const GURL& url,
                                       const base::FilePath& plugin_path);
 
   // Callback function when requesting permission to access the PPAPI broker.
@@ skipping 445 matching lines @@
   // Adds/removes a callback called on creation of each new WebContents.
   static void AddCreatedCallbackForTesting(const CreatedCallback& callback);
   static void RemoveCreatedCallbackForTesting(const CreatedCallback& callback);
 
   DISALLOW_COPY_AND_ASSIGN(FriendZone);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_IMPL_H_