Remove the enable_themes build flag and define.

chrome/browser/search/instant_service_factory.cc

Index: chrome/browser/search/instant_service_factory.cc
diff --git a/chrome/browser/search/instant_service_factory.cc b/chrome/browser/search/instant_service_factory.cc
index 6cc76f32869dc70cb95d3083d820adbc29f33ec6..c2d9e926e8976d0a9258de88da78cda02e61752f 100644
--- a/chrome/browser/search/instant_service_factory.cc
+++ b/chrome/browser/search/instant_service_factory.cc
@@ -4,6 +4,7 @@
 
 #include "chrome/browser/search/instant_service_factory.h"
 
+#include "build/build_config.h"
 #include "chrome/browser/history/top_sites_factory.h"
 #include "chrome/browser/profiles/incognito_helpers.h"
 #include "chrome/browser/profiles/profile.h"
@@ -34,7 +35,7 @@ InstantServiceFactory::InstantServiceFactory()
         BrowserContextDependencyManager::GetInstance()) {
   DependsOn(suggestions::SuggestionsServiceFactory::GetInstance());
   DependsOn(TemplateURLServiceFactory::GetInstance());
-#if defined(ENABLE_THEMES)
+#if !defined(OS_ANDROID)
   DependsOn(ThemeServiceFactory::GetInstance());
 #endif
   DependsOn(TopSitesFactory::GetInstance());