Use std::nullptr_t instead of decltype(nullptr)

webrtc/base/scoped_ptr.h

Index: webrtc/base/scoped_ptr.h
diff --git a/webrtc/base/scoped_ptr.h b/webrtc/base/scoped_ptr.h
index 203a00138e62de3a2473b8fd4efcfb6cb4311d29..6f1898fcc995ee37463b4df3e8203400339dbe98 100644
--- a/webrtc/base/scoped_ptr.h
+++ b/webrtc/base/scoped_ptr.h
@@ -103,6 +103,7 @@
 #include <stdlib.h>
 
 #include <algorithm>  // For std::swap().
+#include <cstddef>
 
 #include "webrtc/base/constructormagic.h"
 #include "webrtc/base/template_util.h"
@@ -342,7 +343,7 @@ class scoped_ptr {
   scoped_ptr(element_type* p, const D& d) : impl_(p, d) {}
 
   // Constructor.  Allows construction from a nullptr.
-  scoped_ptr(decltype(nullptr)) : impl_(nullptr) {}
+  scoped_ptr(std::nullptr_t) : impl_(nullptr) {}
 
   // Constructor.  Allows construction from a scoped_ptr rvalue for a
   // convertible type and deleter.
@@ -379,7 +380,7 @@ class scoped_ptr {
 
   // operator=.  Allows assignment from a nullptr. Deletes the currently owned
   // object, if any.
-  scoped_ptr& operator=(decltype(nullptr)) {
+  scoped_ptr& operator=(std::nullptr_t) {
     reset();
     return *this;
   }
@@ -499,7 +500,7 @@ class scoped_ptr<T[], D> {
   explicit scoped_ptr(element_type* array) : impl_(array) {}
 
   // Constructor.  Allows construction from a nullptr.
-  scoped_ptr(decltype(nullptr)) : impl_(nullptr) {}
+  scoped_ptr(std::nullptr_t) : impl_(nullptr) {}
 
   // Constructor.  Allows construction from a scoped_ptr rvalue.
   scoped_ptr(scoped_ptr&& other) : impl_(&other.impl_) {}
@@ -512,7 +513,7 @@ class scoped_ptr<T[], D> {
 
   // operator=.  Allows assignment from a nullptr. Deletes the currently owned
   // array, if any.
-  scoped_ptr& operator=(decltype(nullptr)) {
+  scoped_ptr& operator=(std::nullptr_t) {
     reset();
     return *this;
   }