Move all knowledge of X sampling into SkScaledCodec

src/codec/SkBmpCodec.cpp

Index: src/codec/SkBmpCodec.cpp
diff --git a/src/codec/SkBmpCodec.cpp b/src/codec/SkBmpCodec.cpp
index 4ae57c057ab2d7c51d698e565be12a1c224560f7..da3e0a28070800c3e3044c192e19653eea3dc1cd 100644
--- a/src/codec/SkBmpCodec.cpp
+++ b/src/codec/SkBmpCodec.cpp
@@ -580,11 +580,6 @@ SkCodec::Result SkBmpCodec::onStartScanlineDecode(const SkImageInfo& dstInfo,
         // Subsets are not supported.
         return kUnimplemented;
     }
-    if (dstInfo.dimensions() != this->getInfo().dimensions()) {
-        if (!SkScaledCodec::DimensionsSupportedForSampling(this->getInfo(), dstInfo)) {
-            return SkCodec::kInvalidScale;
-        }
-    }
     if (!conversion_possible(dstInfo, this->getInfo())) {
         SkCodecPrintf("Error: cannot convert input type to output type.\n");
         return kInvalidConversion;