ifdef various extensions code to be used only when extensions are enabled.

chrome/browser/autocomplete/autocomplete_classifier_factory.cc

 // Copyright (c) 2012 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/autocomplete/autocomplete_classifier_factory.h"
 
 #include "chrome/browser/autocomplete/autocomplete_classifier.h"
 #include "chrome/browser/autocomplete/autocomplete_controller.h"
 #include "chrome/browser/autocomplete/chrome_autocomplete_scheme_classifier.h"
 #include "chrome/browser/autocomplete/shortcuts_backend_factory.h"
 #include "chrome/browser/profiles/incognito_helpers.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/search_engines/template_url_service_factory.h"
 #include "components/keyed_service/content/browser_context_dependency_manager.h"
+
+#if defined(ENABLE_EXTENSIONS)
 #include "extensions/browser/extension_system_provider.h"
 #include "extensions/browser/extensions_browser_client.h"
+#endif
 
 // static
 AutocompleteClassifier* AutocompleteClassifierFactory::GetForProfile(
     Profile* profile) {
   return static_cast<AutocompleteClassifier*>(
       GetInstance()->GetServiceForBrowserContext(profile, true));
 }
 
 // static
 AutocompleteClassifierFactory* AutocompleteClassifierFactory::GetInstance() {
   return Singleton<AutocompleteClassifierFactory>::get();
 }
 
 // static
 KeyedService* AutocompleteClassifierFactory::BuildInstanceFor(
     content::BrowserContext* context) {
   Profile* profile = static_cast<Profile*>(context);
   return new AutocompleteClassifier(
       make_scoped_ptr(new AutocompleteController(
           profile, TemplateURLServiceFactory::GetForProfile(profile), NULL,
           AutocompleteClassifier::kDefaultOmniboxProviders)),
       scoped_ptr<AutocompleteSchemeClassifier>(
           new ChromeAutocompleteSchemeClassifier(profile)));
 }
 
 AutocompleteClassifierFactory::AutocompleteClassifierFactory()
     : BrowserContextKeyedServiceFactory(
         "AutocompleteClassifier",
         BrowserContextDependencyManager::GetInstance()) {
+#if defined(ENABLE_EXTENSIONS)
   DependsOn(
       extensions::ExtensionsBrowserClient::Get()->GetExtensionSystemFactory());
+#endif
   DependsOn(TemplateURLServiceFactory::GetInstance());
   // TODO(pkasting): Uncomment these once they exist.
   //   DependsOn(PrefServiceFactory::GetInstance());
   DependsOn(ShortcutsBackendFactory::GetInstance());
 }
 
 AutocompleteClassifierFactory::~AutocompleteClassifierFactory() {
 }
 
 content::BrowserContext* AutocompleteClassifierFactory::GetBrowserContextToUse(
     content::BrowserContext* context) const {
   return chrome::GetBrowserContextRedirectedInIncognito(context);
 }
 
 bool AutocompleteClassifierFactory::ServiceIsNULLWhileTesting() const {
   return true;
 }
 
 KeyedService* AutocompleteClassifierFactory::BuildServiceInstanceFor(
     content::BrowserContext* profile) const {
   return BuildInstanceFor(static_cast<Profile*>(profile));
 }