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

Review URL: https://codereview.chromium.org/1316233002
diff --git a/src/effects/SkTileImageFilter.cpp b/src/effects/SkTileImageFilter.cpp
index 9292b26..5e633a3 100644
--- a/src/effects/SkTileImageFilter.cpp
+++ b/src/effects/SkTileImageFilter.cpp
@@ -19,7 +19,7 @@
 SkTileImageFilter* SkTileImageFilter::Create(const SkRect& srcRect, const SkRect& dstRect,
                                              SkImageFilter* input) {
     if (!SkIsValidRect(srcRect) || !SkIsValidRect(dstRect)) {
-        return NULL;
+        return nullptr;
     }
     return new SkTileImageFilter(srcRect, dstRect, input);
 }
@@ -60,7 +60,7 @@
     }
 
     SkAutoTUnref<SkBaseDevice> device(proxy->createDevice(w, h));
-    if (NULL == device.get()) {
+    if (nullptr == device.get()) {
         return false;
     }
     SkCanvas canvas(device);