Beginning of support for extension content verification

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/files/file_path.h"
@@ skipping 152 matching lines @@
 
 void ShellExtensionSystem::UnregisterExtensionWithRequestContexts(
     const std::string& extension_id,
     const UnloadedExtensionInfo::Reason reason) {
 }
 
 const OneShotEvent& ShellExtensionSystem::ready() const {
   return ready_;
 }
 
+ContentVerifier* ShellExtensionSystem::content_verifier() {
+  return NULL;
+}
+
 }  // namespace extensions