Remove unnecessary getColorSpace() API from SkCodec

bench/ColorCodecBench.cpp

Index: bench/ColorCodecBench.cpp
diff --git a/bench/ColorCodecBench.cpp b/bench/ColorCodecBench.cpp
index 45bd293991785446c90bdc5ee21f971216bb6755..e17d597abb04ae2865343b607f675c73be636854 100644
--- a/bench/ColorCodecBench.cpp
+++ b/bench/ColorCodecBench.cpp
@@ -47,7 +47,7 @@ void ColorCodecBench::decodeAndXform() {
     codec->startScanlineDecode(fSrcInfo);
     SkASSERT(SkCodec::kSuccess == result);
 
-    sk_sp<SkColorSpace> srcSpace = sk_ref_sp(codec->getColorSpace());
+    sk_sp<SkColorSpace> srcSpace = sk_ref_sp(codec->getInfo().colorSpace());
     if (!srcSpace) {
         srcSpace = SkColorSpace::NewNamed(SkColorSpace::kSRGB_Named);
     }