Remove unused ExtensionService::shared_module_policy_provider_.

chrome/browser/extensions/extension_service.cc

 // Copyright (c) 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 "chrome/browser/extensions/extension_service.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <iterator>
@@ skipping 361 matching lines @@
        i != external_extension_providers_.end(); ++i) {
     extensions::ExternalProviderInterface* provider = i->get();
     provider->ServiceShutdown();
   }
 }
 
 void ExtensionService::Shutdown() {
   extensions::ExtensionManagementFactory::GetInstance()
       ->GetForBrowserContext(profile())
       ->RemoveObserver(this);
-  system_->management_policy()->UnregisterProvider(
-      shared_module_policy_provider_.get());
 }
 
 const Extension* ExtensionService::GetExtensionById(
     const std::string& id, bool include_disabled) const {
   int include_mask = ExtensionRegistry::ENABLED;
   if (include_disabled) {
     // Include blacklisted and blocked extensions here because there are
     // hundreds of callers of this function, and many might assume that this
     // includes those that have been disabled due to blacklisting or blocking.
     include_mask |= ExtensionRegistry::DISABLED |
@@ skipping 2073 matching lines @@
 }
 
 void ExtensionService::OnProfileDestructionStarted() {
   ExtensionIdSet ids_to_unload = registry_->enabled_extensions().GetIDs();
   for (ExtensionIdSet::iterator it = ids_to_unload.begin();
        it != ids_to_unload.end();
        ++it) {
     UnloadExtension(*it, UnloadedExtensionInfo::REASON_PROFILE_SHUTDOWN);
   }
 }