Use sk_sp<SkBitmap::Allocator> instead of raw pointers or WTF::RefPtr<T>.

third_party/WebKit/Source/platform/image-decoders/ImageDecoder.h

Index: third_party/WebKit/Source/platform/image-decoders/ImageDecoder.h
diff --git a/third_party/WebKit/Source/platform/image-decoders/ImageDecoder.h b/third_party/WebKit/Source/platform/image-decoders/ImageDecoder.h
index 51c81a37251705429adeecc8aa2a694606ffd686..a6c6f0848ba4990aff6fb3d796fe7f057159b134 100644
--- a/third_party/WebKit/Source/platform/image-decoders/ImageDecoder.h
+++ b/third_party/WebKit/Source/platform/image-decoders/ImageDecoder.h
@@ -258,7 +258,7 @@ public:
     // and returns true. Otherwise returns false.
     virtual bool hotSpot(IntPoint&) const { return false; }
 
-    virtual void setMemoryAllocator(SkBitmap::Allocator* allocator)
+    virtual void setMemoryAllocator(sk_sp<SkBitmap::Allocator> allocator)
     {
         // FIXME: this doesn't work for images with multiple frames.
         if (m_frameBufferCache.isEmpty()) {
@@ -266,7 +266,7 @@ public:
             m_frameBufferCache[0].setRequiredPreviousFrameIndex(
                 findRequiredPreviousFrame(0, false));
         }
-        m_frameBufferCache[0].setMemoryAllocator(allocator);
+        m_frameBufferCache[0].setMemoryAllocator(std::move(allocator));
     }
 
     virtual bool canDecodeToYUV() { return false; }