SkBitmap and SkPixelRef no longer need lock/unlock

chrome/browser/ui/libgtkui/skia_utils_gtk.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 "chrome/browser/ui/libgtkui/skia_utils_gtk.h"
 
 #include <gdk/gdk.h>
 
 #include "base/logging.h"
 #include "third_party/skia/include/core/SkBitmap.h"
@@ skipping 70 matching lines @@
     NOTREACHED();
   }
 
   return ret;
 }
 
 GdkPixbuf* GdkPixbufFromSkBitmap(const SkBitmap& bitmap) {
   if (bitmap.isNull())
     return nullptr;
 
-  SkAutoLockPixels lock_pixels(bitmap);
-
   int width = bitmap.width();
   int height = bitmap.height();
 
   GdkPixbuf* pixbuf =
       gdk_pixbuf_new(GDK_COLORSPACE_RGB,  // The only colorspace gtk supports.
                      TRUE,                // There is an alpha channel.
                      8, width, height);
 
   // SkBitmaps are premultiplied, we need to unpremultiply them.
   const int kBytesPerPixel = 4;
@@ skipping 17 matching lines @@
         divided[i + 3] = alpha;
       }
       i += kBytesPerPixel;
     }
   }
 
   return pixbuf;
 }
 
 }  // namespace libgtkui