Minor GrRenderTarget retraction

src/core/SkImageCacherator.cpp

Index: src/core/SkImageCacherator.cpp
diff --git a/src/core/SkImageCacherator.cpp b/src/core/SkImageCacherator.cpp
index 7b5ff2267774463584c525bdd0f2cc5ee3fcbd8a..0df14df95c5f8f3542acbee5060f84f14a6549d2 100644
--- a/src/core/SkImageCacherator.cpp
+++ b/src/core/SkImageCacherator.cpp
@@ -291,11 +291,11 @@ GrTexture* SkImageCacherator::lockTexture(GrContext* ctx, const GrUniqueKey& key
     {
         ScopedGenerator generator(this);
         Generator_GrYUVProvider provider(generator);
-        GrTexture* tex = provider.refAsTexture(ctx, desc, true);
+        sk_sp<GrTexture> tex = provider.refAsTexture(ctx, desc, true);
         if (tex) {
             SK_HISTOGRAM_ENUMERATION("LockTexturePath", kYUV_LockTexturePath,
                                      kLockTexturePathCount);
-            return set_key_and_return(tex, key);
+            return set_key_and_return(tex.release(), key);
         }
     }