C++11 declares a type safe null pointer

content/common/gpu/client/gpu_video_encode_accelerator_host.cc

Index: content/common/gpu/client/gpu_video_encode_accelerator_host.cc
diff --git a/content/common/gpu/client/gpu_video_encode_accelerator_host.cc b/content/common/gpu/client/gpu_video_encode_accelerator_host.cc
index c33e27078120b70cf04c53cc6d311716062075cd..2476f22951feb753f241814d317409f02371cfca 100644
--- a/content/common/gpu/client/gpu_video_encode_accelerator_host.cc
+++ b/content/common/gpu/client/gpu_video_encode_accelerator_host.cc
@@ -22,7 +22,7 @@ GpuVideoEncodeAcceleratorHost::GpuVideoEncodeAcceleratorHost(
     CommandBufferProxyImpl* impl)
     : channel_(channel),
       encoder_route_id_(MSG_ROUTING_NONE),
-      client_(NULL),
+      client_(nullptr),
       impl_(impl),
       next_frame_id_(0),
       weak_this_factory_(this) {
@@ -64,7 +64,7 @@ void GpuVideoEncodeAcceleratorHost::OnChannelError() {
   if (channel_) {
     if (encoder_route_id_ != MSG_ROUTING_NONE)
       channel_->RemoveRoute(encoder_route_id_);
-    channel_ = NULL;
+    channel_ = nullptr;
   }
   NOTIFY_ERROR(kPlatformFailureError) << "OnChannelError()";
 }
@@ -182,13 +182,13 @@ void GpuVideoEncodeAcceleratorHost::Destroy() {
   DCHECK(CalledOnValidThread());
   if (channel_)
     Send(new AcceleratedVideoEncoderMsg_Destroy(encoder_route_id_));
-  client_ = NULL;
+  client_ = nullptr;
   delete this;
 }
 
 void GpuVideoEncodeAcceleratorHost::OnWillDeleteImpl() {
   DCHECK(CalledOnValidThread());
-  impl_ = NULL;
+  impl_ = nullptr;
 
   // The CommandBufferProxyImpl is going away; error out this VEA.
   OnChannelError();
@@ -245,7 +245,7 @@ void GpuVideoEncodeAcceleratorHost::OnNotifyInputDone(int32 frame_id) {
     OnNotifyError(kPlatformFailureError);
     return;
   }
-  frame = NULL;  // Not necessary but nice to be explicit; see fun-fact above.
+  frame = nullptr; // Not necessary but nice to be explicit; see fun-fact above.
 }
 
 void GpuVideoEncodeAcceleratorHost::OnBitstreamBufferReady(
@@ -270,7 +270,7 @@ void GpuVideoEncodeAcceleratorHost::OnNotifyError(Error error) {
 
   // Client::NotifyError() may Destroy() |this|, so calling it needs to be the
   // last thing done on this stack!
-  media::VideoEncodeAccelerator::Client* client = NULL;
+  media::VideoEncodeAccelerator::Client* client = nullptr;
   std::swap(client_, client);
   client->NotifyError(error);
 }