clean up (partially) colortable api

Needs this to land: https://codereview.chromium.org/2789853002/

Bug: skia:
Change-Id: I38d916a546b7fa64d000d973e695ddda24a589e7
Reviewed-on: https://skia-review.googlesource.com/10600
Commit-Queue: Mike Reed <reed@google.com>
Reviewed-by: Matt Sarett <msarett@google.com>
diff --git a/tests/WritePixelsTest.cpp b/tests/WritePixelsTest.cpp
index c38e4d6..cace6b1 100644
--- a/tests/WritePixelsTest.cpp
+++ b/tests/WritePixelsTest.cpp
@@ -263,7 +263,7 @@
     if (!bm->setInfo(info, rowBytes)) {
         return false;
     }
-    sk_sp<SkPixelRef> pr(SkMallocPixelRef::NewAllocate(info, rowBytes, nullptr));
+    sk_sp<SkPixelRef> pr = SkMallocPixelRef::MakeAllocate(info, rowBytes, nullptr);
     bm->setPixelRef(std::move(pr), 0, 0);
     return true;
 }