Style Change: NULL->nullptr

gm/textblobuseaftergpufree.cpp

Index: gm/textblobuseaftergpufree.cpp
diff --git a/gm/textblobuseaftergpufree.cpp b/gm/textblobuseaftergpufree.cpp
index 363cd2fed916edcf6a713ddb5c77ff303182be23..91681b82ac6404b83825a49b59cd4268f22b835f 100644
--- a/gm/textblobuseaftergpufree.cpp
+++ b/gm/textblobuseaftergpufree.cpp
@@ -31,7 +31,7 @@ protected:
 
     void onDraw(SkCanvas* canvas) override {
         // This GM exists to test a specific feature of the GPU backend.
-        if (NULL == canvas->getGrContext()) {
+        if (nullptr == canvas->getGrContext()) {
             this->drawGpuOnlyMessage(canvas);
             return;
         }