SkMakeUnique.h defines skstd::make_unique<T>(Args...)

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2293963002

Review-Url: https://codereview.chromium.org/2293963002
diff --git a/tests/PDFPrimitivesTest.cpp b/tests/PDFPrimitivesTest.cpp
index 1faecb5..1001b99 100644
--- a/tests/PDFPrimitivesTest.cpp
+++ b/tests/PDFPrimitivesTest.cpp
@@ -12,6 +12,7 @@
 #include "SkDocument.h"
 #include "SkDeflate.h"
 #include "SkImageEncoder.h"
+#include "SkMakeUnique.h"
 #include "SkMatrix.h"
 #include "SkPDFCanon.h"
 #include "SkPDFDevice.h"
@@ -75,8 +76,8 @@
 
 static void TestPDFStream(skiatest::Reporter* reporter) {
     char streamBytes[] = "Test\nFoo\tBar";
-    std::unique_ptr<SkStreamAsset> streamData(new SkMemoryStream(
-        streamBytes, strlen(streamBytes), true));
+    auto streamData = skstd::make_unique<SkMemoryStream>(
+            streamBytes, strlen(streamBytes), true);
     auto stream = sk_make_sp<SkPDFStream>(std::move(streamData));
     assert_emit_eq(reporter,
                    *stream,