C++11 declares a type safe null pointer

content/common/gpu/gpu_command_buffer_stub.cc

Index: content/common/gpu/gpu_command_buffer_stub.cc
diff --git a/content/common/gpu/gpu_command_buffer_stub.cc b/content/common/gpu/gpu_command_buffer_stub.cc
index e66d71335e06be7031c87d53471530707ad8f714..ca546056da162be00e4bf46c72e6911cd9d22a3e 100644
--- a/content/common/gpu/gpu_command_buffer_stub.cc
+++ b/content/common/gpu/gpu_command_buffer_stub.cc
@@ -192,7 +192,7 @@ GpuCommandBufferStub::GpuCommandBufferStub(
         mailbox_manager,
         new GpuCommandBufferMemoryTracker(channel),
         channel_->gpu_channel_manager()->shader_translator_cache(),
-        NULL,
+        nullptr,
         attrib_parser.bind_generates_resource);
   }
 
@@ -415,7 +415,7 @@ void GpuCommandBufferStub::Destroy() {
     OnRetireSyncPoint(sync_points_.front());
 
   if (decoder_)
-    decoder_->set_engine(NULL);
+    decoder_->set_engine(nullptr);
 
   // The scheduler has raw references to the decoder and the command buffer so
   // destroy it before those.
@@ -437,7 +437,7 @@ void GpuCommandBufferStub::Destroy() {
   command_buffer_.reset();
 
   // Remove this after crbug.com/248395 is sorted out.
-  surface_ = NULL;
+  surface_ = nullptr;
 }
 
 void GpuCommandBufferStub::OnInitializeFailed(IPC::Message* reply_message) {
@@ -520,7 +520,7 @@ void GpuCommandBufferStub::OnInitialize(
       // offscreen surface might not be compatible with this surface.
       // Need to adjust at least GLX to be able to create the initial context
       // with a config that is compatible with onscreen and offscreen surfaces.
-      context = NULL;
+      context = nullptr;
 
       DLOG(ERROR) << "Failed to initialize virtual GL context.";
       OnInitializeFailed(reply_message);