keep only one typedef for the native drawing context

ui/native_theme/native_theme_win.cc

Index: ui/native_theme/native_theme_win.cc
diff --git a/ui/native_theme/native_theme_win.cc b/ui/native_theme/native_theme_win.cc
index eb03ae51ad6f3595fbddc584441a787b4965da73..46c5b5db8cc1aa9fd978d392abfda84e46c23ed4 100644
--- a/ui/native_theme/native_theme_win.cc
+++ b/ui/native_theme/native_theme_win.cc
@@ -293,7 +293,7 @@ void NativeThemeWin::Paint(SkCanvas* canvas,
   }
 
   skia::ScopedPlatformPaint paint(canvas);
-  HDC surface = paint.GetPlatformSurface();
+  HDC surface = paint.GetNativeDrawingContext();
 
   // When drawing the task manager or the bookmark editor, we draw into an
   // offscreen buffer, where we can use OS-specific drawing routines for