SkBitmap and SkPixelRef no longer need lock/unlock

cc/layers/scrollbar_layer_unittest.cc

Index: cc/layers/scrollbar_layer_unittest.cc
diff --git a/cc/layers/scrollbar_layer_unittest.cc b/cc/layers/scrollbar_layer_unittest.cc
index 68613e87e33360ad4da748168d35c9d155151e2f..b4deb9d96e31ca6e197a17bb0e1b025b49f75331 100644
--- a/cc/layers/scrollbar_layer_unittest.cc
+++ b/cc/layers/scrollbar_layer_unittest.cc
@@ -1208,10 +1208,8 @@ class ScaledScrollbarLayerTestScaledRasterization : public ScrollbarLayerTest {
 
     DCHECK(bitmap);
 
-    AutoLockUIResourceBitmap locked_bitmap(*bitmap);
-
     const SkColor* pixels =
-        reinterpret_cast<const SkColor*>(locked_bitmap.GetPixels());
+        reinterpret_cast<const SkColor*>(bitmap->GetPixels());
     SkColor color = argb_to_skia(
         scrollbar_layer->fake_scrollbar()->paint_fill_color());
     int width = bitmap->GetSize().width();