SkBitmap and SkPixelRef no longer need lock/unlock

ui/gfx/codec/png_codec.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 "ui/gfx/codec/png_codec.h"
 
 #include <stdint.h>
 
 #include "base/logging.h"
 #include "base/macros.h"
@@ skipping 713 matching lines @@
 
 bool InternalEncodeSkBitmap(const SkBitmap& input,
                             bool discard_transparency,
                             int compression_level,
                             std::vector<unsigned char>* output) {
   if (input.empty() || input.isNull())
     return false;
   int bpp = input.bytesPerPixel();
   DCHECK(bpp == 1 || bpp == 4);  // We support kA8_Config and kARGB_8888_Config.
 
-  SkAutoLockPixels lock_input(input);
   unsigned char* inputAddr = bpp == 1 ?
       reinterpret_cast<unsigned char*>(input.getAddr8(0, 0)) :
       reinterpret_cast<unsigned char*>(input.getAddr32(0, 0));    // bpp = 4
   return EncodeWithCompressionLevel(
       inputAddr,
       PNGCodec::FORMAT_SkBitmap,
       Size(input.width(), input.height()),
       static_cast<int>(input.rowBytes()),
       discard_transparency,
       std::vector<PNGCodec::Comment>(),
@@ skipping 52 matching lines @@
 }
 
 PNGCodec::Comment::Comment(const std::string& k, const std::string& t)
     : key(k), text(t) {
 }
 
 PNGCodec::Comment::~Comment() {
 }
 
 }  // namespace gfx