C++11 declares a type safe null pointer

content/common/gpu/client/context_provider_command_buffer.cc

Index: content/common/gpu/client/context_provider_command_buffer.cc
diff --git a/content/common/gpu/client/context_provider_command_buffer.cc b/content/common/gpu/client/context_provider_command_buffer.cc
index a4c3111c0cea56475463ae9eac507a986afb95b3..b9907db6ea50cfdcb80bf9816c7d5e6331658ec0 100644
--- a/content/common/gpu/client/context_provider_command_buffer.cc
+++ b/content/common/gpu/client/context_provider_command_buffer.cc
@@ -24,7 +24,7 @@ class ContextProviderCommandBuffer::LostContextCallbackProxy
   }
 
   virtual ~LostContextCallbackProxy() {
-    provider_->context3d_->setContextLostCallback(NULL);
+    provider_->context3d_->setContextLostCallback(nullptr);
   }
 
   virtual void onContextLost() {
@@ -40,7 +40,7 @@ ContextProviderCommandBuffer::Create(
     scoped_ptr<WebGraphicsContext3DCommandBufferImpl> context3d,
     const std::string& debug_name) {
   if (!context3d)
-    return NULL;
+    return nullptr;
 
   return new ContextProviderCommandBuffer(context3d.Pass(), debug_name);
 }