[base] Migrate SkSurface creation to SkSurfaces factories

Follow-up to http://review.skia.org/687639

Change-Id: I37ed05e68fa8d8edcad55e7700aca67e371f512d
diff --git a/libs/hwui/tests/unit/SkiaCanvasTests.cpp b/libs/hwui/tests/unit/SkiaCanvasTests.cpp
index 87c5216..e53fcaa 100644
--- a/libs/hwui/tests/unit/SkiaCanvasTests.cpp
+++ b/libs/hwui/tests/unit/SkiaCanvasTests.cpp
@@ -36,7 +36,7 @@
 using namespace android::uirenderer;
 
 TEST(SkiaCanvas, drawShadowLayer) {
-    auto surface = SkSurface::MakeRasterN32Premul(10, 10);
+    auto surface = SkSurfaces::Raster(SkImageInfo::MakeN32Premul(10, 10));
     SkiaCanvas canvas(surface->getCanvas());
 
     // clear to white