Prune shared extendion module after extension updating.

chrome/browser/extensions/error_console/error_console.h

 // Copyright 2013 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_ERROR_CONSOLE_ERROR_CONSOLE_H_
 #define CHROME_BROWSER_EXTENSIONS_ERROR_CONSOLE_ERROR_CONSOLE_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "base/observer_list.h"
 #include "base/prefs/pref_change_registrar.h"
@@ skipping 115 matching lines @@
 
   // ExtensionRegistry implementation. If the Apps Developer Tools app is
   // installed or uninstalled, we may need to turn the ErrorConsole on/off.
   virtual void OnExtensionUnloaded(
       content::BrowserContext* browser_context,
       const Extension* extension,
       UnloadedExtensionInfo::Reason reason) OVERRIDE;
   virtual void OnExtensionLoaded(content::BrowserContext* browser_context,
                                  const Extension* extension) OVERRIDE;
   virtual void OnExtensionInstalled(content::BrowserContext* browser_context,
-                                    const Extension* extension) OVERRIDE;
+                                    const Extension* extension,
+                                    bool is_update) OVERRIDE;
   virtual void OnExtensionUninstalled(content::BrowserContext* browser_context,
                                       const Extension* extension) OVERRIDE;
 
   // Add manifest errors from an extension's install warnings.
   void AddManifestErrorsForExtension(const Extension* extension);
 
   // content::NotificationObserver implementation.
   virtual void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE;
@@ skipping 35 matching lines @@
 
   ScopedObserver<ExtensionRegistry, ExtensionRegistryObserver>
       registry_observer_;
 
   DISALLOW_COPY_AND_ASSIGN(ErrorConsole);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_ERROR_CONSOLE_ERROR_CONSOLE_H_