C++11 declares a type safe null pointer

content/common/gpu/client/gpu_video_decode_accelerator_host.cc

Index: content/common/gpu/client/gpu_video_decode_accelerator_host.cc
diff --git a/content/common/gpu/client/gpu_video_decode_accelerator_host.cc b/content/common/gpu/client/gpu_video_decode_accelerator_host.cc
index a7844678001fe513535d9ac6d3266bdafe0c2bab..b49a5b29aeee0cbba026f6b0bb05028ff8322c28 100644
--- a/content/common/gpu/client/gpu_video_decode_accelerator_host.cc
+++ b/content/common/gpu/client/gpu_video_decode_accelerator_host.cc
@@ -25,7 +25,7 @@ GpuVideoDecodeAcceleratorHost::GpuVideoDecodeAcceleratorHost(
     CommandBufferProxyImpl* impl)
     : channel_(channel),
       decoder_route_id_(MSG_ROUTING_NONE),
-      client_(NULL),
+      client_(nullptr),
       impl_(impl),
       weak_this_factory_(this) {
   DCHECK(channel_);
@@ -73,7 +73,7 @@ void GpuVideoDecodeAcceleratorHost::OnChannelError() {
   if (channel_) {
     if (decoder_route_id_ != MSG_ROUTING_NONE)
       channel_->RemoveRoute(decoder_route_id_);
-    channel_ = NULL;
+    channel_ = nullptr;
   }
   DLOG(ERROR) << "OnChannelError()";
   PostNotifyError(PLATFORM_FAILURE);
@@ -173,13 +173,13 @@ void GpuVideoDecodeAcceleratorHost::Destroy() {
   DCHECK(CalledOnValidThread());
   if (channel_)
     Send(new AcceleratedVideoDecoderMsg_Destroy(decoder_route_id_));
-  client_ = NULL;
+  client_ = nullptr;
   delete this;
 }
 
 void GpuVideoDecodeAcceleratorHost::OnWillDeleteImpl() {
   DCHECK(CalledOnValidThread());
-  impl_ = NULL;
+  impl_ = nullptr;
 
   // The CommandBufferProxyImpl is going away; error out this VDA.
   OnChannelError();
@@ -261,7 +261,7 @@ void GpuVideoDecodeAcceleratorHost::OnNotifyError(uint32 error) {
 
   // Client::NotifyError() may Destroy() |this|, so calling it needs to be the
   // last thing done on this stack!
-  media::VideoDecodeAccelerator::Client* client = NULL;
+  media::VideoDecodeAccelerator::Client* client = nullptr;
   std::swap(client, client_);
   client->NotifyError(static_cast<media::VideoDecodeAccelerator::Error>(error));
 }