Replace RefPtrs with raw pointers (imageFromNode in Editor.cpp)

third_party/WebKit/Source/core/html/HTMLCanvasElement.h

Index: third_party/WebKit/Source/core/html/HTMLCanvasElement.h
diff --git a/third_party/WebKit/Source/core/html/HTMLCanvasElement.h b/third_party/WebKit/Source/core/html/HTMLCanvasElement.h
index c337a6ea877a3593409654ef8ac69b0d8f5ee734..bbe3335ada4e959ba2e977af742cd7de3bf7d9a7 100644
--- a/third_party/WebKit/Source/core/html/HTMLCanvasElement.h
+++ b/third_party/WebKit/Source/core/html/HTMLCanvasElement.h
@@ -132,7 +132,7 @@ public:
 
     void ensureUnacceleratedImageBuffer();
     ImageBuffer* buffer() const;
-    PassRefPtr<Image> copiedImage(SourceDrawingBuffer, AccelerationHint) const;
+    Image* copiedImage(SourceDrawingBuffer, AccelerationHint) const;
     void clearCopiedImage();
 
     SecurityOrigin* getSecurityOrigin() const;
@@ -239,6 +239,8 @@ private:
 
     String toDataURLInternal(const String& mimeType, const double& quality, SourceDrawingBuffer) const;
 
+    Image* ensureTransparentImage() const;
+
     HeapHashSet<WeakMember<CanvasDrawListener>> m_listeners;
 
     IntSize m_size;
@@ -262,6 +264,8 @@ private:
 
     // Used for OffscreenCanvas that controls this HTML canvas element
     std::unique_ptr<CanvasSurfaceLayerBridge> m_surfaceLayerBridge;
+
+    mutable RefPtr<Image> m_transparentImage;
 };
 
 } // namespace blink