keep only one typedef for the native drawing context

skia/ext/bitmap_platform_device_win.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef SKIA_EXT_BITMAP_PLATFORM_DEVICE_WIN_H_
 #define SKIA_EXT_BITMAP_PLATFORM_DEVICE_WIN_H_
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "skia/ext/platform_device.h"
@@ skipping 29 matching lines @@
 
   ~BitmapPlatformDevice() override;
 
  protected:
   SkBaseDevice* onCreateDevice(const CreateInfo&, const SkPaint*) override;
 
  private:
   // PlatformDevice override
   // Retrieves the bitmap DC, which is the memory DC for our bitmap data. The
   // bitmap DC may be lazily created.
-  PlatformSurface BeginPlatformPaint(const SkMatrix& transform,
-                                     const SkIRect& clip_bounds) override;
+  NativeDrawingContext BeginPlatformPaint(const SkMatrix& transform,
+                                          const SkIRect& clip_bounds) override;
 
   // Private constructor.
   BitmapPlatformDevice(HBITMAP hbitmap, const SkBitmap& bitmap);
 
   // Bitmap into which the drawing will be done. This bitmap not owned by this
   // class, but by the BitmapPlatformPixelRef inside the device's SkBitmap.
   // It's only stored here in order to lazy-create the DC (below).
   HBITMAP hbitmap_;
 
   // Previous bitmap held by the DC. This will be selected back before the
@@ skipping 12 matching lines @@
   // when |hbitmap_| is NULL (will be a NOP).
   void LoadConfig(const SkMatrix& transform, const SkIRect& clip_bounds);
 
   DISALLOW_COPY_AND_ASSIGN(BitmapPlatformDevice);
   friend class ScopedPlatformPaint;
 };
 
 }  // namespace skia
 
 #endif  // SKIA_EXT_BITMAP_PLATFORM_DEVICE_WIN_H_