Update Windows UI on system color changes.

ui/native_theme/native_theme_observer.cc

Index: ui/native_theme/native_theme_observer.cc
diff --git a/ui/base/win/internal_constants.cc b/ui/native_theme/native_theme_observer.cc
similarity index 60%
copy from ui/base/win/internal_constants.cc
copy to ui/native_theme/native_theme_observer.cc
index 325ab90468bfe94320f921806123cd7d8341ab60..f516a762027fccab32d569f2466d82c65252c104 100644
--- a/ui/base/win/internal_constants.cc
+++ b/ui/native_theme/native_theme_observer.cc
@@ -2,12 +2,10 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "ui/base/win/internal_constants.h"
+#include "ui/native_theme/native_theme_observer.h"
 
 namespace ui {
 
-const wchar_t kIgnoreTouchMouseActivateForWindow[] =
-    L"Chrome.IgnoreMouseActivate";
+NativeThemeObserver::~NativeThemeObserver() {}
 
 }  // namespace ui
-