Get rid of the extension's "Current Version" file.

chrome/browser/extensions/extensions_service.h

 // Copyright (c) 2009 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_EXTENSIONS_SERVICE_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSIONS_SERVICE_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 285 matching lines @@
   void SetProviderForTesting(Extension::Location location,
                              ExternalExtensionProvider* test_provider);
 
   // ExternalExtensionProvider::Visitor implementation.
   virtual void OnExternalExtensionFound(const std::string& id,
                                         const Version* version,
                                         const FilePath& path,
                                         Extension::Location location);
  private:
   // Loads a single installed extension.
-  void LoadInstalledExtension(const std::string& id, const FilePath& path,
+  void LoadInstalledExtension(DictionaryValue* manifest,
+                              const std::string& id,
+                              const FilePath& path,
                               Extension::Location location);
 
   // Finish installing the extension in |crx_path| after it has been unpacked to
   // |unpacked_path|.  If |expected_id| is not empty, it's verified against the
   // extension's manifest before installation. If |silent| is true, there will
   // be no install confirmation dialog. |from_gallery| indicates whether the
   // crx was installed from our gallery, which results in different UI.
   //
   // Note: We take ownership of |extension|.
   void OnExtensionUnpacked(
@@ skipping 44 matching lines @@
 
   // A map of all external extension providers.
   typedef std::map<Extension::Location,
                    linked_ptr<ExternalExtensionProvider> > ProviderMap;
   ProviderMap external_extension_providers_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionsServiceBackend);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSIONS_SERVICE_H_