Remove skia::PlatformBitmap.

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/basictypes.h"
 #include "base/compiler_specific.h"
 #include "skia/ext/platform_device.h"
 #include "skia/ext/refptr.h"
 
 namespace skia {
 
 // A device is basically a wrapper around SkBitmap that provides a surface for
 // SkCanvas to draw into. Our device provides a surface Windows can also write
 // to. BitmapPlatformDevice creates a bitmap using CreateDIBSection() in a
 // 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.
-//
-// The GDI bitmap created for drawing is actually owned by a
-// PlatformBitmapPixelRef, and stored in an SkBitmap via the normal skia
-// SkPixelRef refcounting mechanism. In this way, the GDI bitmap can outlive
-// the device created to draw into it. So it is safe to call accessBitmap() on
-// the device, and retain the returned SkBitmap.
 class SK_API 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.
   //
   // The |shared_section| parameter is optional (pass NULL for default
   // behavior). If |shared_section| is non-null, then it must be a handle to a
   // file-mapping object returned by CreateFileMapping.  See CreateDIBSection
   // for details. If |shared_section| is null, the bitmap backing store is not
   // initialized.
@@ skipping 75 matching lines @@
 #ifdef SK_DEBUG
   int begin_paint_count_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(BitmapPlatformDevice);
 };
 
 }  // namespace skia
 
 #endif  // SKIA_EXT_BITMAP_PLATFORM_DEVICE_WIN_H_