Remove nativeImage deprecated methods (#11978)

* remove deprecated nativeimage methods

* remove .only from spec

atom/common/api/atom_api_native_image.cc

@@ -583,10 +583,7 @@ void NativeImage::BuildPrototype(
       .SetMethod("resize", &NativeImage::Resize)
       .SetMethod("crop", &NativeImage::Crop)
       .SetMethod("getAspectRatio", &NativeImage::GetAspectRatio)
-      .SetMethod("addRepresentation", &NativeImage::AddRepresentation)
-      // TODO(kevinsawicki): Remove in 2.0, deprecate before then with warnings
-      .SetMethod("toPng", &NativeImage::ToPNG)
-      .SetMethod("toJpeg", &NativeImage::ToJPEG);
+      .SetMethod("addRepresentation", &NativeImage::AddRepresentation);
 }
 
 }  // namespace api

spec/api-native-image-spec.js

@@ -162,9 +162,6 @@ describe('nativeImage module', () => {
       const imageI = nativeImage.createFromBuffer(imageA.toBitmap(),
         {width: 538, height: 190, scaleFactor: 2.0})
       expect(imageI.getSize()).to.deep.equal({width: 269, height: 95})
-
-      const imageJ = nativeImage.createFromBuffer(imageA.toPNG(), 2.0)
-      expect(imageJ.getSize()).to.deep.equal({width: 269, height: 95})
     })
   })