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

chrome/browser/ui/webui/chrome_web_ui_controller_factory.cc

Index: chrome/browser/ui/webui/chrome_web_ui_controller_factory.cc
diff --git a/chrome/browser/ui/webui/chrome_web_ui_controller_factory.cc b/chrome/browser/ui/webui/chrome_web_ui_controller_factory.cc
index 45a8f8e15141a545a5b82b3c3b6ff7d87d551b2f..89d12565b48f4326cc4a66be28b3633f60f40205 100644
--- a/chrome/browser/ui/webui/chrome_web_ui_controller_factory.cc
+++ b/chrome/browser/ui/webui/chrome_web_ui_controller_factory.cc
@@ -159,6 +159,7 @@ 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,
@@ -171,6 +172,7 @@ 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<>