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

Review URL: https://codereview.chromium.org/1316233002
diff --git a/src/gpu/gl/builders/GrGLVertexShaderBuilder.cpp b/src/gpu/gl/builders/GrGLVertexShaderBuilder.cpp
index 983de21..0189932 100644
--- a/src/gpu/gl/builders/GrGLVertexShaderBuilder.cpp
+++ b/src/gpu/gl/builders/GrGLVertexShaderBuilder.cpp
@@ -15,7 +15,7 @@
 
 GrGLVertexBuilder::GrGLVertexBuilder(GrGLProgramBuilder* program)
     : INHERITED(program)
-    , fRtAdjustName(NULL) {
+    , fRtAdjustName(nullptr) {
 }
 
 void GrGLVertexBuilder::addVarying(const char* name, GrGLVarying* v) {