Use std::unique_ptr.

tests/ImageTest.cpp

Index: tests/ImageTest.cpp
diff --git a/tests/ImageTest.cpp b/tests/ImageTest.cpp
index 27e2e793faa02f9b0f788258c521e97364db0945..da9268dded166a514e1d349b8b8209abe8fca1eb 100644
--- a/tests/ImageTest.cpp
+++ b/tests/ImageTest.cpp
@@ -164,7 +164,7 @@ static void test_encode(skiatest::Reporter* reporter, SkImage* image) {
     assert_equal(reporter, image, nullptr, decoded);
 
     // Now see if we can instantiate an image from a subset of the surface/origEncoded
-    
+
     decoded.reset(SkImage::NewFromEncoded(origEncoded, &ir));
     REPORTER_ASSERT(reporter, decoded);
     assert_equal(reporter, image, &ir, decoded);
@@ -878,7 +878,7 @@ DEF_GPUTEST_FOR_NATIVE_CONTEXT(DeferredTextureImage, reporter, context, glContex
                 for (auto budgeted : { SkBudgeted::kNo, SkBudgeted::kYes }) {
                     SkAutoTUnref<SkImage> newImage(
                         SkImage::NewFromDeferredTextureImageData(context, buffer, budgeted));
-                    REPORTER_ASSERT(reporter, SkToBool(newImage));
+                    REPORTER_ASSERT(reporter, newImage != nullptr);
                     if (newImage) {
                         check_images_same(reporter, image, newImage);
                     }