Remove skia::PlatformBitmap.

skia/ext/bitmap_platform_device_cairo.cc

 // Copyright 2013 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.
 
 #include "skia/ext/bitmap_platform_device_cairo.h"
 #include "skia/ext/platform_canvas.h"
 
 #if defined(OS_OPENBSD)
 #include <cairo.h>
 #else
@@ skipping 182 matching lines @@
 
 // PlatformCanvas impl
 
 SkCanvas* CreatePlatformCanvas(int width, int height, bool is_opaque,
                                uint8_t* data, OnFailureType failureType) {
   skia::RefPtr<SkBaseDevice> dev = skia::AdoptRef(
       BitmapPlatformDevice::Create(width, height, is_opaque, data));
   return CreateCanvas(dev, failureType);
 }
 
-// Port of PlatformBitmap to linux
-PlatformBitmap::~PlatformBitmap() {
-  cairo_destroy(surface_);
-}
-
-bool PlatformBitmap::Allocate(int width, int height, bool is_opaque) {
-  // The SkBitmap allocates and owns the bitmap memory; PlatformBitmap owns the
-  // cairo drawing context tied to the bitmap. The SkBitmap's pixelRef can
-  // outlive the PlatformBitmap if additional copies are made.
-  int stride = cairo_format_stride_for_width(CAIRO_FORMAT_ARGB32, width);
-
-  cairo_surface_t* surf = cairo_image_surface_create(
-      CAIRO_FORMAT_ARGB32,
-      width,
-      height);
-  if (cairo_surface_status(surf) != CAIRO_STATUS_SUCCESS) {
-    cairo_surface_destroy(surf);
-    return false;
-  }
-  return InstallCairoSurfacePixels(&bitmap_, surf, is_opaque);
-}
-
 }  // namespace skia