Protect references to ThemeService* with ENABLE_THEMES

chrome/browser/extensions/extension_service.cc

Index: chrome/browser/extensions/extension_service.cc
diff --git a/chrome/browser/extensions/extension_service.cc b/chrome/browser/extensions/extension_service.cc
index 8cc4bb17e8a4647aacd4fb6634e3311226b9088e..1f2a8870c0a7e3e5329905e9ba160c315adf10fe 100644
--- a/chrome/browser/extensions/extension_service.cc
+++ b/chrome/browser/extensions/extension_service.cc
@@ -1873,12 +1873,14 @@ void ExtensionService::GarbageCollectExtensions() {
               extension_paths)))
     NOTREACHED();
 
+#if defined(ENABLE_THEMES)
   // Also garbage-collect themes.  We check |profile_| to be
   // defensive; in the future, we may call GarbageCollectExtensions()
   // from somewhere other than Init() (e.g., in a timer).
   if (profile_) {
     ThemeServiceFactory::GetForProfile(profile_)->RemoveUnusedThemes();
   }
+#endif
 }
 
 void ExtensionService::SyncExtensionChangeIfNeeded(const Extension& extension) {