C++11 declares a type safe null pointer

content/common/gpu/gpu_channel_manager.cc

Index: content/common/gpu/gpu_channel_manager.cc
diff --git a/content/common/gpu/gpu_channel_manager.cc b/content/common/gpu/gpu_channel_manager.cc
index d52bca38c8e78b91502d738a6e417968a354b3fe..f17cd7fdb1f342aeb18d63772e6b8a352db748b3 100644
--- a/content/common/gpu/gpu_channel_manager.cc
+++ b/content/common/gpu/gpu_channel_manager.cc
@@ -29,7 +29,8 @@ class GpuChannelManagerMessageFilter : public IPC::MessageFilter {
  public:
   GpuChannelManagerMessageFilter(
       GpuMemoryBufferFactory* gpu_memory_buffer_factory)
-      : sender_(NULL), gpu_memory_buffer_factory_(gpu_memory_buffer_factory) {}
+      : sender_(nullptr),
+        gpu_memory_buffer_factory_(gpu_memory_buffer_factory) {}
 
   virtual void OnFilterAdded(IPC::Sender* sender) override {
     DCHECK(!sender_);
@@ -38,7 +39,7 @@ class GpuChannelManagerMessageFilter : public IPC::MessageFilter {
 
   virtual void OnFilterRemoved() override {
     DCHECK(sender_);
-    sender_ = NULL;
+    sender_ = nullptr;
   }
 
   virtual bool OnMessageReceived(const IPC::Message& message) override {
@@ -103,7 +104,7 @@ GpuChannelManager::~GpuChannelManager() {
   gpu_channels_.clear();
   if (default_offscreen_surface_.get()) {
     default_offscreen_surface_->Destroy();
-    default_offscreen_surface_ = NULL;
+    default_offscreen_surface_ = nullptr;
   }
 }
 
@@ -146,7 +147,7 @@ void GpuChannelManager::RemoveRoute(int32 routing_id) {
 GpuChannel* GpuChannelManager::LookupChannel(int32 client_id) {
   GpuChannelMap::const_iterator iter = gpu_channels_.find(client_id);
   if (iter == gpu_channels_.end())
-    return NULL;
+    return nullptr;
   else
     return iter->second;
 }
@@ -172,8 +173,8 @@ void GpuChannelManager::OnEstablishChannel(int client_id,
                                            bool allow_future_sync_points) {
   IPC::ChannelHandle channel_handle;
 
-  gfx::GLShareGroup* share_group = NULL;
-  gpu::gles2::MailboxManager* mailbox_manager = NULL;
+  gfx::GLShareGroup* share_group = nullptr;
+  gpu::gles2::MailboxManager* mailbox_manager = nullptr;
   if (share_context) {
     if (!share_group_.get()) {
       share_group_ = new gfx::GLShareGroup;