Drop virtual LightSource::create

Source/platform/graphics/filters/DistantLightSource.h

Index: Source/platform/graphics/filters/DistantLightSource.h
diff --git a/Source/platform/graphics/filters/DistantLightSource.h b/Source/platform/graphics/filters/DistantLightSource.h
index ecf3efdc85c810b4dc84d14ad1101a5c853f7a12..0ffe0577e17cb4966e246da0b181e10fb1d406a3 100644
--- a/Source/platform/graphics/filters/DistantLightSource.h
+++ b/Source/platform/graphics/filters/DistantLightSource.h
@@ -34,11 +34,6 @@ public:
         return adoptRef(new DistantLightSource(azimuth, elevation));
     }
 
-    PassRefPtr<LightSource> create(const FloatPoint3D& scale, const FloatSize& offset) const override
-    {
-        return adoptRef(new DistantLightSource(m_azimuth, m_elevation));
-    }
-
     float azimuth() const { return m_azimuth; }
     float elevation() const { return m_elevation; }