C++11 declares a type safe null pointer

content/common/gpu/image_transport_surface.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/common/gpu/image_transport_surface.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
@@ skipping 27 matching lines @@
 #if defined(OS_ANDROID)
     surface = CreateTransportSurface(manager, stub, handle);
 #else
     surface = new NullTransportSurface(manager, stub, handle);
 #endif
   } else {
     surface = CreateNativeSurface(manager, stub, handle);
   }
 
   if (!surface.get() || !surface->Initialize())
-    return NULL;
+    return nullptr;
   return surface;
 }
 
 ImageTransportHelper::ImageTransportHelper(ImageTransportSurface* surface,
                                            GpuChannelManager* manager,
                                            GpuCommandBufferStub* stub,
                                            gfx::PluginWindowHandle handle)
     : surface_(surface),
       manager_(manager),
       stub_(stub->AsWeakPtr()),
@@ skipping 103 matching lines @@
   }
 #endif
   if (CommandLine::ForCurrentProcess()->HasSwitch(switches::kDisableGpuVsync))
     context->SetSwapInterval(0);
   else
     context->SetSwapInterval(1);
 }
 
 gpu::GpuScheduler* ImageTransportHelper::Scheduler() {
   if (!stub_.get())
-    return NULL;
+    return nullptr;
   return stub_->scheduler();
 }
 
 gpu::gles2::GLES2Decoder* ImageTransportHelper::Decoder() {
   if (!stub_.get())
-    return NULL;
+    return nullptr;
   return stub_->decoder();
 }
 
 #if defined(OS_MACOSX)
 void ImageTransportHelper::OnBufferPresented(
     const AcceleratedSurfaceMsg_BufferPresented_Params& params) {
   surface_->OnBufferPresented(params);
 }
 #endif
 
@@ skipping 108 matching lines @@
 void PassThroughImageTransportSurface::SendVSyncUpdateIfAvailable() {
   gfx::VSyncProvider* vsync_provider = GetVSyncProvider();
   if (vsync_provider) {
     vsync_provider->GetVSyncParameters(
       base::Bind(&ImageTransportHelper::SendUpdateVSyncParameters,
                  helper_->AsWeakPtr()));
   }
 }
 
 }  // namespace content