C++11 declares a type safe null pointer

content/common/gpu/gpu_channel.h

Index: content/common/gpu/gpu_channel.h
diff --git a/content/common/gpu/gpu_channel.h b/content/common/gpu/gpu_channel.h
index cfa71d1e2db83781b4b5a7a279f4a847ed59b60a..eb626feae719a37f874e859988cc8390ecda667a 100644
--- a/content/common/gpu/gpu_channel.h
+++ b/content/common/gpu/gpu_channel.h
@@ -132,7 +132,7 @@ class GpuChannel : public IPC::Listener, public IPC::Sender {
   uint64 messages_processed() const { return messages_processed_; }
 
   // If |preemption_flag->IsSet()|, any stub on this channel
-  // should stop issuing GL commands. Setting this to NULL stops deferral.
+  // should stop issuing GL commands. Setting this to nullptr stops deferral.
   void SetPreemptByFlag(
       scoped_refptr<gpu::PreemptionFlag> preemption_flag);
 
@@ -180,7 +180,7 @@ class GpuChannel : public IPC::Listener, public IPC::Sender {
   // preempt other GpuChannels.
   scoped_refptr<gpu::PreemptionFlag> preempting_flag_;
 
-  // If non-NULL, all stubs on this channel should stop processing GL
+  // If non-nullptr, all stubs on this channel should stop processing GL
   // commands (via their GpuScheduler) when preempted_flag_->IsSet()
   scoped_refptr<gpu::PreemptionFlag> preempted_flag_;