Mojo: NULL -> nullptr in mojo/system and mojo/embedder.

mojo/system/memory.h

 // 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.
 
 #ifndef MOJO_SYSTEM_MEMORY_H_
 #define MOJO_SYSTEM_MEMORY_H_
 
 #include <stddef.h>
 #include <stdint.h>
 #include <string.h>  // For |memcpy()|.
@@ skipping 73 matching lines @@
 template <typename Type>
 class UserPointer {
  private:
   typedef typename internal::VoidToChar<Type>::type NonVoidType;
 
  public:
   // Instead of explicitly using these constructors, you can often use
   // |MakeUserPointer()| (or |NullUserPointer()| for null pointers). (The common
   // exception is when you have, e.g., a |char*| and want to get a
   // |UserPointer<void>|.)
-  UserPointer() : pointer_(NULL) {}
+  UserPointer() : pointer_(nullptr) {}
   explicit UserPointer(Type* pointer) : pointer_(pointer) {}
   // Allow implicit conversion from the "null user pointer".
-  UserPointer(NullUserPointer) : pointer_(NULL) {}
+  UserPointer(NullUserPointer) : pointer_(nullptr) {}
   ~UserPointer() {}
 
   // Allow assignment from the "null user pointer".
   UserPointer<Type>& operator=(NullUserPointer) {
-    pointer_ = NULL;
+    pointer_ = nullptr;
     return *this;
   }
 
   // Allow conversion to a "non-const" |UserPointer|.
   operator UserPointer<const Type>() const {
     return UserPointer<const Type>(pointer_);
   }
 
   bool IsNull() const { return !pointer_; }
 
@@ skipping 255 matching lines @@
   size_t count_;
   scoped_ptr<Type[]> buffer_;
 
   DISALLOW_COPY_AND_ASSIGN(UserPointerReaderWriter);
 };
 
 }  // namespace system
 }  // namespace mojo
 
 #endif  // MOJO_SYSTEM_MEMORY_H_