Fixed crash when chrome.runtime.reload() is called with app windows open

chrome/browser/extensions/extension_process_manager.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 CHROME_BROWSER_EXTENSIONS_EXTENSION_PROCESS_MANAGER_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_PROCESS_MANAGER_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 181 matching lines @@
   void OnLazyBackgroundPageIdle(const std::string& extension_id,
                                 int sequence_id);
   void OnLazyBackgroundPageActive(const std::string& extension_id);
   void CloseLazyBackgroundPageNow(const std::string& extension_id,
                                   int sequence_id);
 
   // Potentially registers a RenderViewHost, if it is associated with an
   // extension. Does nothing if this is not an extension renderer.
   void RegisterRenderViewHost(content::RenderViewHost* render_view_host);
 
+  // Unregister RenderViewHosts and clear background page data for an extension
+  // which has been unloaded.
+  void UnregisterExtension(const std::string& extension_id);
+
   // Clears background page data for this extension.
   void ClearBackgroundPageData(const std::string& extension_id);
 
   // Returns true if loading background pages should be deferred. This is
   // true if there are no browser windows open and the browser process was
   // started to show the app launcher, or if DeferBackgroundHostCreation was
   // called with true, or if the profile is not yet valid.
   bool DeferLoadingBackgroundHosts() const;
 
   void OnDevToolsStateChanged(content::DevToolsAgentHost*, bool attached);
@@ skipping 17 matching lines @@
   bool defer_background_host_creation_;
 
   base::WeakPtrFactory<ExtensionProcessManager> weak_ptr_factory_;
 
   base::Callback<void(content::DevToolsAgentHost*, bool)> devtools_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionProcessManager);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_PROCESS_MANAGER_H_