Remove dependency on src/android from dm and nanobench

src/android/SkBitmapRegionDecoderPriv.h

Index: src/android/SkBitmapRegionDecoderPriv.h
diff --git a/src/android/SkBitmapRegionDecoderPriv.h b/src/android/SkBitmapRegionDecoderPriv.h
index d7423b05fd5fed12b60c3523a49aab5c3dc52128..baa891e9c31397f13b78bbda96c25f37e00572ae 100644
--- a/src/android/SkBitmapRegionDecoderPriv.h
+++ b/src/android/SkBitmapRegionDecoderPriv.h
@@ -8,10 +8,6 @@
 #ifndef SkBitmapRegionDecoderPriv_DEFINED
 #define SkBitmapRegionDecoderPriv_DEFINED
 
-inline float get_scale_from_sample_size(uint32_t sampleSize) {
-    return 1.0f / (float) sampleSize;
-}
-
 enum SubsetType {
     kFullyInside_SubsetType,
     kPartiallyInside_SubsetType,