Update Windows UI on system color changes.

chrome/browser/themes/theme_service_aurax11.cc

Index: chrome/browser/themes/theme_service_aurax11.cc
diff --git a/chrome/browser/themes/theme_service_aurax11.cc b/chrome/browser/themes/theme_service_aurax11.cc
index 7da0336070fa5bc8861cfa8d210314a9dfb097ef..b9313d5bee4a23fe1cd759db428989d98171a32d 100644
--- a/chrome/browser/themes/theme_service_aurax11.cc
+++ b/chrome/browser/themes/theme_service_aurax11.cc
@@ -64,17 +64,9 @@ NativeThemeX11::~NativeThemeX11() {}
 
 }  // namespace
 
-ThemeServiceAuraX11::ThemeServiceAuraX11() {
-  views::LinuxUI* linux_ui = views::LinuxUI::instance();
-  if (linux_ui)
-    linux_ui->AddNativeThemeChangeObserver(this);
-}
+ThemeServiceAuraX11::ThemeServiceAuraX11() {}
 
-ThemeServiceAuraX11::~ThemeServiceAuraX11() {
-  views::LinuxUI* linux_ui = views::LinuxUI::instance();
-  if (linux_ui)
-    linux_ui->RemoveNativeThemeChangeObserver(this);
-}
+ThemeServiceAuraX11::~ThemeServiceAuraX11() {}
 
 bool ThemeServiceAuraX11::ShouldInitWithNativeTheme() const {
   return profile()->GetPrefs()->GetBoolean(prefs::kUsesSystemTheme);
@@ -93,8 +85,3 @@ bool ThemeServiceAuraX11::UsingNativeTheme() const {
   return theme_supplier &&
          theme_supplier->get_theme_type() == CustomThemeSupplier::NATIVE_X11;
 }
-
-void ThemeServiceAuraX11::OnNativeThemeChanged() {
-  if (UsingNativeTheme())
-    NotifyThemeChanged();
-}