Style Change: NULL->nullptr

tools/skpdiff/SkDiffContext.cpp

Index: tools/skpdiff/SkDiffContext.cpp
diff --git a/tools/skpdiff/SkDiffContext.cpp b/tools/skpdiff/SkDiffContext.cpp
index 5add0df515c23d0e7737c59a3f0d34b8977044b7..8da346ed5c301d9c9a222f4304c0727526cedcfb 100644
--- a/tools/skpdiff/SkDiffContext.cpp
+++ b/tools/skpdiff/SkDiffContext.cpp
@@ -22,7 +22,7 @@
 #include "skpdiff_util.h"
 
 SkDiffContext::SkDiffContext() {
-    fDiffers = NULL;
+    fDiffers = nullptr;
     fDifferCount = 0;
 }
 
@@ -58,7 +58,7 @@ void SkDiffContext::setDiffers(const SkTDArray<SkImageDiffer*>& differs) {
     // Delete whatever the last array of differs was
     if (fDiffers) {
         delete[] fDiffers;
-        fDiffers = NULL;
+        fDiffers = nullptr;
         fDifferCount = 0;
     }