Start hiding deprecated skia/ext/ functions

skia/ext/bitmap_platform_device_win.h

Index: skia/ext/bitmap_platform_device_win.h
diff --git a/skia/ext/bitmap_platform_device_win.h b/skia/ext/bitmap_platform_device_win.h
index d4c92598260fdc9960ae848948790678b85428cd..3ff944fbb88ff49c4c1211bd417b26163e0687cb 100644
--- a/skia/ext/bitmap_platform_device_win.h
+++ b/skia/ext/bitmap_platform_device_win.h
@@ -19,7 +19,7 @@ class ScopedPlatformPaint;
 // format that Skia supports and can then use this to draw ClearType into, etc.
 // This pixel data is provided to the bitmap that the device contains so that it
 // can be shared.
-class SK_API BitmapPlatformDevice : public SkBitmapDevice, public PlatformDevice {
+class BitmapPlatformDevice : public SkBitmapDevice, public PlatformDevice {
  public:
   // Factory function. is_opaque should be set if the caller knows the bitmap
   // will be completely opaque and allows some optimizations.