C++11 declares a type safe null pointer

content/common/gpu/client/webgraphicscontext3d_command_buffer_impl.cc

Index: content/common/gpu/client/webgraphicscontext3d_command_buffer_impl.cc
diff --git a/content/common/gpu/client/webgraphicscontext3d_command_buffer_impl.cc b/content/common/gpu/client/webgraphicscontext3d_command_buffer_impl.cc
index 83d9dbfdb0945ce46429b17b146ed57b7d8a377b..fd460e40d69f181d00527618fd7ed6a403eacc7b 100644
--- a/content/common/gpu/client/webgraphicscontext3d_command_buffer_impl.cc
+++ b/content/common/gpu/client/webgraphicscontext3d_command_buffer_impl.cc
@@ -112,7 +112,7 @@ WebGraphicsContext3DCommandBufferImpl::WebGraphicsContext3DCommandBufferImpl(
 WebGraphicsContext3DCommandBufferImpl::
     ~WebGraphicsContext3DCommandBufferImpl() {
   if (real_gl_) {
-    real_gl_->SetErrorMessageCallback(NULL);
+    real_gl_->SetErrorMessageCallback(nullptr);
   }
 
   Destroy();
@@ -156,7 +156,7 @@ bool WebGraphicsContext3DCommandBufferImpl::InitializeCommandBuffer(
   if (!host_.get())
     return false;
 
-  CommandBufferProxyImpl* share_group_command_buffer = NULL;
+  CommandBufferProxyImpl* share_group_command_buffer = nullptr;
 
   if (share_context) {
     share_group_command_buffer = share_context->command_buffer_.get();
@@ -208,7 +208,7 @@ bool WebGraphicsContext3DCommandBufferImpl::CreateContext(bool onscreen) {
   scoped_ptr<base::AutoLock> share_group_lock;
   bool add_to_share_group = false;
   if (!command_buffer_) {
-    WebGraphicsContext3DCommandBufferImpl* share_context = NULL;
+    WebGraphicsContext3DCommandBufferImpl* share_context = nullptr;
 
     share_group_lock.reset(new base::AutoLock(share_group_->lock()));
     share_context = share_group_->GetAnyContextLocked();
@@ -295,7 +295,7 @@ void WebGraphicsContext3DCommandBufferImpl::Destroy() {
     // issued on this context might not be visible to other contexts in the
     // share group.
     gl->Flush();
-    setGLInterface(NULL);
+    setGLInterface(nullptr);
   }
 
   trace_gl_.reset();
@@ -310,7 +310,7 @@ void WebGraphicsContext3DCommandBufferImpl::Destroy() {
     command_buffer_.reset();
   }
 
-  host_ = NULL;
+  host_ = nullptr;
 }
 
 gpu::ContextSupport*
@@ -352,10 +352,10 @@ WebGraphicsContext3DCommandBufferImpl::CreateOffscreenContext(
     const SharedMemoryLimits& limits,
     WebGraphicsContext3DCommandBufferImpl* share_context) {
   if (!host)
-    return NULL;
+    return nullptr;
 
   if (share_context && share_context->IsCommandBufferContextLost())
-    return NULL;
+    return nullptr;
 
   return new WebGraphicsContext3DCommandBufferImpl(
       0,