remove dead SK_SUPPORT_LEGACY_IMAGEDECODER_CHOOSER code

src/images/SkImageDecoder_libgif.cpp

Index: src/images/SkImageDecoder_libgif.cpp
diff --git a/src/images/SkImageDecoder_libgif.cpp b/src/images/SkImageDecoder_libgif.cpp
index fb5d18fc0870b1be25caf18aaea110aa5867186a..1d0e500206a5dac6673431d50a40147574e17028 100644
--- a/src/images/SkImageDecoder_libgif.cpp
+++ b/src/images/SkImageDecoder_libgif.cpp
@@ -310,13 +310,6 @@ SkImageDecoder::Result SkGIFImageDecoder::onDecode(SkStream* sk_stream, SkBitmap
                 imageTop = 0;
             }
 
-#ifdef SK_SUPPORT_LEGACY_IMAGEDECODER_CHOOSER
-            // FIXME: We could give the caller a choice of images or configs.
-            if (!this->chooseFromOneChoice(kIndex_8_SkColorType, width, height)) {
-                return error_return(*bm, "chooseFromOneChoice");
-            }
-#endif
-
             SkScaledBitmapSampler sampler(width, height, this->getSampleSize());
 
             bm->setInfo(SkImageInfo::Make(sampler.scaledWidth(), sampler.scaledHeight(),