cc: Renamed approximate{BytesUsed,OpCount} in paint op buffer.

cc/paint/drawing_display_item.cc

Index: cc/paint/drawing_display_item.cc
diff --git a/cc/paint/drawing_display_item.cc b/cc/paint/drawing_display_item.cc
index 60b09ee0e2723cfd09bf86f0eb75781c96d6133c..f8819c01e9864f1805cdc283ee70f7b2e31a14f0 100644
--- a/cc/paint/drawing_display_item.cc
+++ b/cc/paint/drawing_display_item.cc
@@ -19,12 +19,12 @@ DrawingDisplayItem::DrawingDisplayItem(const DrawingDisplayItem& item)
 DrawingDisplayItem::~DrawingDisplayItem() = default;
 
 size_t DrawingDisplayItem::ExternalMemoryUsage() const {
-  return picture->approximateBytesUsed();
+  return picture->bytes_used();
 }
 
 DISABLE_CFI_PERF
-int DrawingDisplayItem::ApproximateOpCount() const {
-  return picture->approximateOpCount();
+size_t DrawingDisplayItem::OpCount() const {
+  return picture->size();
 }
 
 }  // namespace cc