C++11 declares a type safe null pointer

content/common/gpu/client/gpu_channel_host.cc

Index: content/common/gpu/client/gpu_channel_host.cc
diff --git a/content/common/gpu/client/gpu_channel_host.cc b/content/common/gpu/client/gpu_channel_host.cc
index d0ceecd26211e2c255ad48504a0c40dd459782a7..55137c51b2bcf657d31b99afe7c0a30291ae9d61 100644
--- a/content/common/gpu/client/gpu_channel_host.cc
+++ b/content/common/gpu/client/gpu_channel_host.cc
@@ -73,12 +73,12 @@ GpuChannelHost::GpuChannelHost(GpuChannelHostFactory* factory,
 
 void GpuChannelHost::Connect(const IPC::ChannelHandle& channel_handle,
                              base::WaitableEvent* shutdown_event) {
-  // Open a channel to the GPU process. We pass NULL as the main listener here
-  // since we need to filter everything to route it to the right thread.
+  // Open a channel to the GPU process. We pass nullptr as the main listener
+  // here since we need to filter everything to route it to the right thread.
   scoped_refptr<base::MessageLoopProxy> io_loop = factory_->GetIOLoopProxy();
   channel_ = IPC::SyncChannel::Create(channel_handle,
                                       IPC::Channel::MODE_CLIENT,
-                                      NULL,
+                                      nullptr,
                                       io_loop.get(),
                                       true,
                                       shutdown_event);
@@ -165,7 +165,7 @@ CommandBufferProxyImpl* GpuChannelHost::CreateViewCommandBuffer(
                      channel_filter_.get()));
     }
 
-    return NULL;
+    return nullptr;
   }
 
   CommandBufferProxyImpl* command_buffer =
@@ -198,13 +198,13 @@ CommandBufferProxyImpl* GpuChannelHost::CreateOffscreenCommandBuffer(
                                                            route_id,
                                                            &succeeded))) {
     LOG(ERROR) << "Failed to send GpuChannelMsg_CreateOffscreenCommandBuffer.";
-    return NULL;
+    return nullptr;
   }
 
   if (!succeeded) {
     LOG(ERROR)
         << "GpuChannelMsg_CreateOffscreenCommandBuffer returned failure.";
-    return NULL;
+    return nullptr;
   }
 
   CommandBufferProxyImpl* command_buffer =