Run clang-modernize -use-nullptr over src/extensions/.

extensions/browser/api/system_memory/memory_info_provider.cc

 // Copyright 2013 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 "extensions/browser/api/system_memory/memory_info_provider.h"
 
 #include "base/sys_info.h"
 
 namespace extensions {
 
 using core_api::system_memory::MemoryInfo;
 
 // Static member intialization.
 base::LazyInstance<scoped_refptr<MemoryInfoProvider> >
     MemoryInfoProvider::provider_ = LAZY_INSTANCE_INITIALIZER;
 
 MemoryInfoProvider::MemoryInfoProvider() {
 }
 
 MemoryInfoProvider::~MemoryInfoProvider() {
 }
 
 void MemoryInfoProvider::InitializeForTesting(
     scoped_refptr<MemoryInfoProvider> provider) {
-  DCHECK(provider.get() != NULL);
+  DCHECK(provider.get() != nullptr);
   provider_.Get() = provider;
 }
 
 bool MemoryInfoProvider::QueryInfo() {
   info_.capacity = static_cast<double>(base::SysInfo::AmountOfPhysicalMemory());
   info_.available_capacity =
       static_cast<double>(base::SysInfo::AmountOfAvailablePhysicalMemory());
   return true;
 }
 
 // static
 MemoryInfoProvider* MemoryInfoProvider::Get() {
-  if (provider_.Get().get() == NULL)
+  if (provider_.Get().get() == nullptr)
     provider_.Get() = new MemoryInfoProvider();
   return provider_.Get().get();
 }
 
 }  // namespace extensions