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

Review URL: https://codereview.chromium.org/1316233002
diff --git a/samplecode/SamplePdfFileViewer.cpp b/samplecode/SamplePdfFileViewer.cpp
index 747f729..950d42b 100644
--- a/samplecode/SamplePdfFileViewer.cpp
+++ b/samplecode/SamplePdfFileViewer.cpp
@@ -38,8 +38,8 @@
 
     static SkPicture* LoadPdf(const char path[]) {
         SkAutoTDelete<SkPdfRenderer> renderer(SkPdfRenderer::CreateFromFile(path));
-        if (NULL == renderer.get()) {
-            return NULL;
+        if (nullptr == renderer.get()) {
+            return nullptr;
         }
 
         SkPicture* pic = new SkPicture;
@@ -51,8 +51,8 @@
     }
 
 public:
-    PdfFileViewer(const char name[] = NULL) : fFilename(name) {
-        fPicture = NULL;
+    PdfFileViewer(const char name[] = nullptr) : fFilename(name) {
+        fPicture = nullptr;
     }
 
     virtual ~PdfFileViewer() {