struct UnloadedExtensionInfo -> enum UnloadedExtensionInfoReason

extensions/browser/extension_system.h

 // Copyright 2014 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 EXTENSIONS_BROWSER_EXTENSION_SYSTEM_H_
 #define EXTENSIONS_BROWSER_EXTENSION_SYSTEM_H_
 
 #include <string>
 
 #include "base/callback_forward.h"
@@ skipping 91 matching lines @@
   // asynchronously. |callback| is run on the calling thread once completed.
   virtual void RegisterExtensionWithRequestContexts(
       const Extension* extension,
       const base::Closure& callback) {}
 
   // Called by the ExtensionService that lives in this system. Lets the
   // info map clean up its RequestContexts once all the listeners to the
   // EXTENSION_UNLOADED notification have finished running.
   virtual void UnregisterExtensionWithRequestContexts(
       const std::string& extension_id,
-      const UnloadedExtensionInfo::Reason reason) {}
+      const UnloadedExtensionReason reason) {}
 
   // Signaled when the extension system has completed its startup tasks.
   virtual const OneShotEvent& ready() const = 0;
 
   // Returns the content verifier, if any.
   virtual ContentVerifier* content_verifier() = 0;
 
   // Get a set of extensions that depend on the given extension.
   // TODO(elijahtaylor): Move SharedModuleService out of chrome/browser
   // so it can be retrieved from ExtensionSystem directly.
   virtual std::unique_ptr<ExtensionSet> GetDependentExtensions(
       const Extension* extension) = 0;
 
   // Install an updated version of |extension_id| with the version given in
   // temp_dir. Ownership of |temp_dir| in the filesystem is transferred and
   // implementors of this function are responsible for cleaning it up on
   // errors, etc.
   virtual void InstallUpdate(const std::string& extension_id,
                              const base::FilePath& temp_dir) = 0;
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_EXTENSION_SYSTEM_H_