Move a bunch of windows stuff from ui/base/win to ui/gfx/win

ui/gfx/sys_color_change_listener.cc

Index: ui/gfx/sys_color_change_listener.cc
diff --git a/ui/gfx/sys_color_change_listener.cc b/ui/gfx/sys_color_change_listener.cc
index 7a9fc84478ff689f3aa43d1f1e05ee0b8be9b00b..d5646b3a81c29340dde1bdad50b38fc8655851e3 100644
--- a/ui/gfx/sys_color_change_listener.cc
+++ b/ui/gfx/sys_color_change_listener.cc
@@ -13,7 +13,7 @@
 #include "base/memory/singleton.h"
 #include "base/observer_list.h"
 #if defined(OS_WIN)
-#include "ui/base/win/singleton_hwnd.h"
+#include "ui/gfx/win/singleton_hwnd.h"
 #endif
 
 namespace gfx {
@@ -48,7 +48,7 @@ bool IsInvertedColorScheme() {
 }
 
 #if defined(OS_WIN)
-class SysColorChangeObserver : public ui::SingletonHwnd::Observer {
+class SysColorChangeObserver : public gfx::SingletonHwnd::Observer {
  public:
   static SysColorChangeObserver* GetInstance();
 
@@ -75,11 +75,11 @@ SysColorChangeObserver* SysColorChangeObserver::GetInstance() {
 }
 
 SysColorChangeObserver::SysColorChangeObserver() {
-  ui::SingletonHwnd::GetInstance()->AddObserver(this);
+  gfx::SingletonHwnd::GetInstance()->AddObserver(this);
 }
 
 SysColorChangeObserver::~SysColorChangeObserver() {
-  ui::SingletonHwnd::GetInstance()->RemoveObserver(this);
+  gfx::SingletonHwnd::GetInstance()->RemoveObserver(this);
 }
 
 void SysColorChangeObserver::AddListener(SysColorChangeListener* listener) {