SkBitmap and SkPixelRef no longer need lock/unlock

third_party/WebKit/Source/platform/graphics/GraphicsLayer.cpp

Index: third_party/WebKit/Source/platform/graphics/GraphicsLayer.cpp
diff --git a/third_party/WebKit/Source/platform/graphics/GraphicsLayer.cpp b/third_party/WebKit/Source/platform/graphics/GraphicsLayer.cpp
index 60f4aada81bfa238b4a0c3cd40b885f17abb282a..384fde6061171d8fc83092b075a594d63e42eb39 100644
--- a/third_party/WebKit/Source/platform/graphics/GraphicsLayer.cpp
+++ b/third_party/WebKit/Source/platform/graphics/GraphicsLayer.cpp
@@ -1244,8 +1244,6 @@ void GraphicsLayer::CheckPaintUnderInvalidations(
     canvas.drawPicture(std::move(new_record));
   }
 
-  old_bitmap.lockPixels();
-  new_bitmap.lockPixels();
   int mismatching_pixels = 0;
   static const int kMaxMismatchesToReport = 50;
   for (int bitmap_y = 0; bitmap_y < rect.Height(); ++bitmap_y) {
@@ -1277,8 +1275,6 @@ void GraphicsLayer::CheckPaintUnderInvalidations(
       }
     }
   }
-  old_bitmap.unlockPixels();
-  new_bitmap.unlockPixels();
 
   // Visualize under-invalidations by overlaying the new bitmap (containing red
   // pixels indicating under-invalidations, and transparent pixels otherwise)