SkBitmap and SkPixelRef no longer need lock/unlock

chrome/browser/media/webrtc/desktop_media_list_base.cc

 // Copyright 2016 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/media/webrtc/desktop_media_list_base.h"
 
 #include <set>
 
 #include "chrome/browser/media/webrtc/desktop_media_list_observer.h"
 #include "content/public/browser/browser_thread.h"
@@ skipping 119 matching lines @@
 void DesktopMediaListBase::ScheduleNextRefresh() {
   BrowserThread::PostDelayedTask(
       BrowserThread::UI, FROM_HERE,
       base::Bind(&DesktopMediaListBase::Refresh, weak_factory_.GetWeakPtr()),
       update_period_);
 }
 
 // static
 uint32_t DesktopMediaListBase::GetImageHash(const gfx::Image& image) {
   SkBitmap bitmap = image.AsBitmap();
-  bitmap.lockPixels();
   uint32_t value =
       base::Hash(reinterpret_cast<char*>(bitmap.getPixels()), bitmap.getSize());
-  bitmap.unlockPixels();
-
   return value;
 }