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

chrome/browser/extensions/api/runtime/runtime_api.cc

Index: chrome/browser/extensions/api/runtime/runtime_api.cc
diff --git a/chrome/browser/extensions/api/runtime/runtime_api.cc b/chrome/browser/extensions/api/runtime/runtime_api.cc
index 91df37ec5dee7ec0677306376bd28d64885c20ea..e105c83771f1ef794c1cc62198a97e17e8fa197a 100644
--- a/chrome/browser/extensions/api/runtime/runtime_api.cc
+++ b/chrome/browser/extensions/api/runtime/runtime_api.cc
@@ -121,12 +121,14 @@ void SetUninstallUrl(ExtensionPrefs* prefs,
                              new base::StringValue(url_string));
 }
 
+#if defined(ENABLE_EXTENSIONS)
 std::string GetUninstallUrl(ExtensionPrefs* prefs,
                             const std::string& extension_id) {
   std::string url_string;
   prefs->ReadPrefAsString(extension_id, kUninstallUrl, &url_string);
   return url_string;
 }
+#endif  // defined(ENABLE_EXTENSIONS)
 
 }  // namespace