Fixes for -Wunused-function on Linux, Android and ChromeOS

chrome/browser/ui/webui/chrome_web_ui_controller_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/ui/webui/chrome_web_ui_controller_factory.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/location.h"
 #include "base/message_loop/message_loop_proxy.h"
@@ skipping 141 matching lines @@
 // may be NULL (for example, if the URL refers to an non-existent extension).
 typedef WebUIController* (*WebUIFactoryFunction)(WebUI* web_ui,
                                                  const GURL& url);
 
 // Template for defining WebUIFactoryFunction.
 template<class T>
 WebUIController* NewWebUI(WebUI* web_ui, const GURL& url) {
   return new T(web_ui);
 }
 
+#if defined(ENABLE_EXTENSIONS)
 // Special cases for extensions.
 template<>
 WebUIController* NewWebUI<ExtensionWebUI>(WebUI* web_ui,
                                           const GURL& url) {
   return new ExtensionWebUI(web_ui, url);
 }
 
 template<>
 WebUIController* NewWebUI<extensions::ExtensionInfoUI>(WebUI* web_ui,
                                                        const GURL& url) {
   return new extensions::ExtensionInfoUI(web_ui, url);
 }
+#endif  // defined(ENABLE_EXTENSIONS)
 
 // Special case for older about: handlers.
 template<>
 WebUIController* NewWebUI<AboutUI>(WebUI* web_ui, const GURL& url) {
   return new AboutUI(web_ui, url.host());
 }
 
 #if defined(OS_CHROMEOS)
 template<>
 WebUIController* NewWebUI<chromeos::OobeUI>(WebUI* web_ui, const GURL& url) {
@@ skipping 461 matching lines @@
   if (page_url.host() == chrome::kChromeUIPluginsHost)
     return PluginsUI::GetFaviconResourceBytes(scale_factor);
 
   // Android doesn't use the components pages.
   if (page_url.host() == chrome::kChromeUIComponentsHost)
     return ComponentsUI::GetFaviconResourceBytes(scale_factor);
 #endif
 
   return NULL;
 }