Delete dead subset benches from nanobench

bench/BitmapRegionDecoderBench.cpp

Index: bench/BitmapRegionDecoderBench.cpp
diff --git a/bench/BitmapRegionDecoderBench.cpp b/bench/BitmapRegionDecoderBench.cpp
index 1d2a0b91f78fe54836ec504f6c7e7c52887d515c..4d9dec03aa2d873a2719bc8d00ce1b30c19d17ec 100644
--- a/bench/BitmapRegionDecoderBench.cpp
+++ b/bench/BitmapRegionDecoderBench.cpp
@@ -24,9 +24,6 @@ BitmapRegionDecoderBench::BitmapRegionDecoderBench(const char* baseName, SkData*
     // Choose a useful name for the region decoding strategy
     const char* strategyName;
     switch (strategy) {
-        case SkBitmapRegionDecoder::kOriginal_Strategy:
-            strategyName = "Original";
-            break;
         case SkBitmapRegionDecoder::kCanvas_Strategy:
             strategyName = "Canvas";
             break;