C++11 declares a type safe null pointer

content/common/gpu/gpu_channel.cc

Index: content/common/gpu/gpu_channel.cc
diff --git a/content/common/gpu/gpu_channel.cc b/content/common/gpu/gpu_channel.cc
index 4290bf91fbe93ffe7c408884bde7d9d6a4f86a2b..599644ea0ee2dd96b5e6d2417ecef4c563bdd3f7 100644
--- a/content/common/gpu/gpu_channel.cc
+++ b/content/common/gpu/gpu_channel.cc
@@ -76,7 +76,7 @@ class GpuChannelMessageFilter : public IPC::MessageFilter {
                           bool future_sync_points)
       : preemption_state_(IDLE),
         gpu_channel_(gpu_channel),
-        sender_(NULL),
+        sender_(nullptr),
         sync_point_manager_(sync_point_manager),
         message_loop_(message_loop),
         messages_forwarded_to_channel_(0),
@@ -90,7 +90,7 @@ class GpuChannelMessageFilter : public IPC::MessageFilter {
 
   virtual void OnFilterRemoved() override {
     DCHECK(sender_);
-    sender_ = NULL;
+    sender_ = nullptr;
   }
 
   virtual bool OnMessageReceived(const IPC::Message& message) override {
@@ -409,7 +409,7 @@ GpuChannel::GpuChannel(GpuChannelManager* gpu_channel_manager,
       watchdog_(watchdog),
       software_(software),
       handle_messages_scheduled_(false),
-      currently_processing_message_(NULL),
+      currently_processing_message_(nullptr),
       num_stubs_descheduled_(0),
       allow_future_sync_points_(allow_future_sync_points),
       weak_factory_(this) {
@@ -511,7 +511,7 @@ void GpuChannel::RequeueMessage() {
   deferred_messages_.push_front(
       new IPC::Message(*currently_processing_message_));
   messages_processed_--;
-  currently_processing_message_ = NULL;
+  currently_processing_message_ = nullptr;
 }
 
 void GpuChannel::OnScheduled() {
@@ -667,8 +667,8 @@ void GpuChannel::HandleMessage() {
   if (deferred_messages_.empty())
     return;
 
-  IPC::Message* m = NULL;
-  GpuCommandBufferStub* stub = NULL;
+  IPC::Message* m = nullptr;
+  GpuCommandBufferStub* stub = nullptr;
 
   m = deferred_messages_.front();
   stub = stubs_.Lookup(m->routing_id());
@@ -691,7 +691,7 @@ void GpuChannel::HandleMessage() {
     result = OnControlMessageReceived(*message);
   else
     result = router_.RouteMessage(*message);
-  currently_processing_message_ = NULL;
+  currently_processing_message_ = nullptr;
 
   if (!result) {
     // Respond to sync messages even if router failed to route.