Remove unnecessary getColorSpace() API from SkCodec

Not needed since now we can get it from the SkImageInfo.

TBR=reed@google.com
BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2170793004

Review-Url: https://codereview.chromium.org/2170793004
diff --git a/tools/viewer/ImageSlide.cpp b/tools/viewer/ImageSlide.cpp
index 3ba6b58..b047154 100644
--- a/tools/viewer/ImageSlide.cpp
+++ b/tools/viewer/ImageSlide.cpp
@@ -41,7 +41,7 @@
     fImage->asLegacyBitmap(&fOriginalBitmap, SkImage::kRO_LegacyBitmapMode);
 
     SkAutoTDelete<SkCodec> codec(SkCodec::NewFromData(encoded.get()));
-    sk_sp<SkColorSpace> srcSpace = sk_ref_sp(codec->getColorSpace());
+    sk_sp<SkColorSpace> srcSpace = sk_ref_sp(codec->getInfo().colorSpace());
     sk_sp<SkColorSpace> dstSpace = SkColorSpace::NewNamed(SkColorSpace::kAdobeRGB_Named);
     std::unique_ptr<SkColorSpaceXform> xform = SkColorSpaceXform::New(srcSpace, dstSpace);
     fOriginalBitmap.deepCopyTo(&fXformedBitmap);