SkBitmap and SkPixelRef no longer need lock/unlock

chrome/browser/media/webrtc/desktop_media_list_base.cc

Index: chrome/browser/media/webrtc/desktop_media_list_base.cc
diff --git a/chrome/browser/media/webrtc/desktop_media_list_base.cc b/chrome/browser/media/webrtc/desktop_media_list_base.cc
index 33f560ffe87042a4a6e60becebfac69b050f4c7a..2f700d3ad31361f16c3a502c96909015bddecfde 100644
--- a/chrome/browser/media/webrtc/desktop_media_list_base.cc
+++ b/chrome/browser/media/webrtc/desktop_media_list_base.cc
@@ -137,10 +137,7 @@ void DesktopMediaListBase::ScheduleNextRefresh() {
 // 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;
 }