Protect references to ThemeService* with ENABLE_THEMES

On android, ENABLE_THEMES and ENABLE_PROTECTOR_SERVICE are not defined.
This fixes some link errors for unit_tests.

BUG=117407
TEST=

Review URL: https://chromiumcodereview.appspot.com/10704148

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@146028 0039d316-1c4b-4281-b951-d872f2087c98

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) {

chrome/browser/extensions/extension_service_unittest.cc

@@ -414,7 +414,9 @@ void ExtensionServiceTestBase::InitializeExtensionService(
   chrome::RegisterUserPrefs(prefs);
   profile->SetPrefService(prefs);
 
+#if defined(ENABLE_THEMES)
   ThemeServiceFactory::GetInstance()->ForceRegisterPrefsForTest(prefs);
+#endif
   PluginPrefsFactory::GetInstance()->ForceRegisterPrefsForTest(prefs);
 
   profile_.reset(profile);

chrome/browser/extensions/extension_system_factory.cc

@@ -33,9 +33,13 @@ ExtensionSystemSharedFactory::ExtensionSystemSharedFactory()
         "ExtensionSystemShared",
         ProfileDependencyManager::GetInstance()) {
   DependsOn(GlobalErrorServiceFactory::GetInstance());
+#if defined(ENABLE_THEMES)
   DependsOn(ThemeServiceFactory::GetInstance());
+#endif
+#if defined(ENABLE_PROTECTOR_SERVICE)
   // ProtectorService should be destroyed after us.
   DependsOn(protector::ProtectorServiceFactory::GetInstance());
+#endif
 }
 
 ExtensionSystemSharedFactory::~ExtensionSystemSharedFactory() {