C++11 declares a type safe null pointer

content/common/page_state_serialization_unittest.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <math.h>
 
 #include "base/base64.h"
 #include "base/files/file_util.h"
 #include "base/path_service.h"
 #include "base/pickle.h"
@@ skipping 78 matching lines @@
 //-----------------------------------------------------------------------------
 
 class PageStateSerializationTest : public testing::Test {
  public:
   void PopulateFrameState(ExplodedFrameState* frame_state) {
     // Invent some data for the various fields.
     frame_state->url_string = NS16("http://dev.chromium.org/");
     frame_state->referrer = NS16("https://www.google.com/search?q=dev.chromium.org");
     frame_state->referrer_policy = blink::WebReferrerPolicyAlways;
     frame_state->target = NS16("foo");
-    frame_state->state_object = NS16(NULL);
+    frame_state->state_object = NS16(nullptr);
     frame_state->document_state.push_back(NS16("1"));
     frame_state->document_state.push_back(NS16("q"));
     frame_state->document_state.push_back(NS16("text"));
     frame_state->document_state.push_back(NS16("dev.chromium.org"));
     frame_state->pinch_viewport_scroll_offset = gfx::PointF(10, 15);
     frame_state->scroll_offset = gfx::Point(0, 100);
     frame_state->item_sequence_number = 1;
     frame_state->document_sequence_number = 2;
     frame_state->frame_sequence_number = 3;
     frame_state->page_scale_factor = 2.0;
@@ skipping 315 matching lines @@
 TEST_F(PageStateSerializationTest, BackwardsCompat_v18) {
   TestBackwardsCompat(18);
 }
 
 TEST_F(PageStateSerializationTest, BackwardsCompat_v20) {
   TestBackwardsCompat(20);
 }
 
 }  // namespace
 }  // namespace content