Style Change: NULL->nullptr
DOCS_PREVIEW= https://skia.org/?cl=1316233002

Review URL: https://codereview.chromium.org/1316233002
diff --git a/tests/RegionTest.cpp b/tests/RegionTest.cpp
index 121f16d..4a96056 100644
--- a/tests/RegionTest.cpp
+++ b/tests/RegionTest.cpp
@@ -266,7 +266,7 @@
 // Test that writeToMemory reports the same number of bytes whether there was a
 // buffer to write to or not.
 static void test_write(const SkRegion& region, skiatest::Reporter* r) {
-    const size_t bytesNeeded = region.writeToMemory(NULL);
+    const size_t bytesNeeded = region.writeToMemory(nullptr);
     SkAutoMalloc storage(bytesNeeded);
     const size_t bytesWritten = region.writeToMemory(storage.get());
     REPORTER_ASSERT(r, bytesWritten == bytesNeeded);