Exempt default apps from external-extension alerts.

chrome/browser/extensions/external_extension_provider_interface.h

 // Copyright (c) 2011 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_EXTERNAL_EXTENSION_PROVIDER_INTERFACE_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTERNAL_EXTENSION_PROVIDER_INTERFACE_H_
 #pragma once
 
 #include <vector>
 
@@ skipping 12 matching lines @@
   // they have. See also VisitRegisteredExtension below. Ownership of |version|
   // is not transferred to the visitor.  Callers of the methods below must
   // ensure that |id| is a valid extension id (use Extension::IdIsValid(id)).
   class VisitorInterface {
    public:
     virtual void OnExternalExtensionFileFound(
         const std::string& id,
         const Version* version,
         const FilePath& path,
         Extension::Location location,
-        int creation_flags) = 0;
+        int creation_flags,
+        bool mark_acknowledged) = 0;
 
     virtual void OnExternalExtensionUpdateUrlFound(
         const std::string& id,
         const GURL& update_url,
         Extension::Location location) = 0;
 
     // Called after all the external extensions have been reported
     // through the above two methods. |provider| is a pointer to the
     // provider that is now ready (typically this), and the
     // implementation of OnExternalProviderReady() should be able to
@@ skipping 28 matching lines @@
 
   // Determines if this provider had loaded the list of external extensions
   // from its source.
   virtual bool IsReady() const = 0;
 };
 
 typedef std::vector<linked_ptr<ExternalExtensionProviderInterface> >
     ProviderCollection;
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTERNAL_EXTENSION_PROVIDER_INTERFACE_H_