Remove skia::PlatformBitmap.

skia/ext/bitmap_platform_device_mac.cc

 // 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.
 
 #include "skia/ext/bitmap_platform_device_mac.h"
 
 #import <ApplicationServices/ApplicationServices.h>
 #include <time.h>
 
 #include "base/mac/mac_util.h"
@@ skipping 280 matching lines @@
   return CreateCanvas(dev, failureType);
 }
 
 SkCanvas* CreatePlatformCanvas(int width, int height, bool is_opaque,
                                uint8_t* data, OnFailureType failureType) {
   skia::RefPtr<SkBaseDevice> dev = skia::AdoptRef(
       BitmapPlatformDevice::CreateWithData(data, width, height, is_opaque));
   return CreateCanvas(dev, failureType);
 }
 
-// Port of PlatformBitmap to mac
-
-PlatformBitmap::~PlatformBitmap() {
-  if (surface_)
-    CGContextRelease(surface_);
-}
-
-bool PlatformBitmap::Allocate(int width, int height, bool is_opaque) {
-  if (RasterDeviceTooBigToAllocate(width, height))
-    return false;
-    
-  if (!bitmap_.tryAllocN32Pixels(width, height, is_opaque))
-    return false;
-
-  if (!is_opaque)
-    bitmap_.eraseColor(0);
-
-  surface_ = CGContextForData(bitmap_.getPixels(), bitmap_.width(),
-                              bitmap_.height());
-  return true;
-}
-
 }  // namespace skia