Remove unused GC::beginRecording flags

Source/platform/graphics/GraphicsContext.h

Index: Source/platform/graphics/GraphicsContext.h
diff --git a/Source/platform/graphics/GraphicsContext.h b/Source/platform/graphics/GraphicsContext.h
index 6e8807ae9c0c3c74d4eae749426efcc65c944e75..a81825ab7383c3cabaffe272a5fb2df287a8d231 100644
--- a/Source/platform/graphics/GraphicsContext.h
+++ b/Source/platform/graphics/GraphicsContext.h
@@ -264,7 +264,7 @@ public:
     // Instead of being dispatched to the active canvas, draw commands following beginRecording()
     // are stored in a display list that can be replayed at a later time. Pass in the bounding
     // rectangle for the content in the list.
-    void beginRecording(const FloatRect&, uint32_t = 0);
+    void beginRecording(const FloatRect&);
     PassRefPtr<const SkPicture> endRecording();
 
     void setShadow(const FloatSize& offset, float blur, const Color&,