Delete the GTK+ port of Chrome.

chrome/browser/themes/theme_service_factory.cc

Index: chrome/browser/themes/theme_service_factory.cc
diff --git a/chrome/browser/themes/theme_service_factory.cc b/chrome/browser/themes/theme_service_factory.cc
index 4bfe354eb91a1b435e351c1c7ac77a4efca72a7b..396d32ab9d261ac9a476fdeb1d2f4ba633c9fd5b 100644
--- a/chrome/browser/themes/theme_service_factory.cc
+++ b/chrome/browser/themes/theme_service_factory.cc
@@ -14,10 +14,6 @@
 #include "components/keyed_service/content/browser_context_dependency_manager.h"
 #include "components/user_prefs/pref_registry_syncable.h"
 
-#if defined(TOOLKIT_GTK)
-#include "chrome/browser/ui/gtk/gtk_theme_service.h"
-#endif
-
 #if defined(USE_AURA) && defined(USE_X11) && !defined(OS_CHROMEOS)
 #include "chrome/browser/themes/theme_service_aurax11.h"
 #include "ui/views/linux_ui/linux_ui.h"
@@ -54,9 +50,7 @@ ThemeServiceFactory::~ThemeServiceFactory() {}
 KeyedService* ThemeServiceFactory::BuildServiceInstanceFor(
     content::BrowserContext* profile) const {
   ThemeService* provider = NULL;
-#if defined(TOOLKIT_GTK)
-  provider = new GtkThemeService;
-#elif defined(USE_AURA) && defined(USE_X11) && !defined(OS_CHROMEOS)
+#if defined(USE_AURA) && defined(USE_X11) && !defined(OS_CHROMEOS)
   provider = new ThemeServiceAuraX11;
 #else
   provider = new ThemeService;
@@ -71,9 +65,7 @@ void ThemeServiceFactory::RegisterProfilePrefs(
 #if defined(USE_X11) && !defined(OS_CHROMEOS)
   bool default_uses_system_theme = false;
 
-#if defined(TOOLKIT_GTK)
-  default_uses_system_theme = GtkThemeService::DefaultUsesSystemTheme();
-#elif defined(USE_AURA) && defined(USE_X11) && !defined(OS_CHROMEOS)
+#if defined(USE_AURA) && defined(USE_X11) && !defined(OS_CHROMEOS)
   const views::LinuxUI* linux_ui = views::LinuxUI::instance();
   if (linux_ui)
     default_uses_system_theme = linux_ui->GetDefaultUsesSystemTheme();