Send an onInstalled event for shared module update

apps/shell/browser/shell_extension_system.cc

 // 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.
 
 #include "apps/shell/browser/shell_extension_system.h"
 
 #include <string>
 
 #include "apps/shell/browser/api/shell/shell_api.h"
 #include "base/file_util.h"
@@ skipping 165 matching lines @@
 }
 
 const OneShotEvent& ShellExtensionSystem::ready() const {
   return ready_;
 }
 
 ContentVerifier* ShellExtensionSystem::content_verifier() {
   return NULL;
 }
 
+scoped_ptr<ExtensionSet> ShellExtensionSystem::GetDependentExtensions(
+    const Extension* extension) {
+  scoped_ptr<ExtensionSet> empty(new ExtensionSet());
+  return empty.PassAs<ExtensionSet>();
+}
+
 }  // namespace extensions