C++11 declares a type safe null pointer

content/common/page_state_serialization.cc

Index: content/common/page_state_serialization.cc
diff --git a/content/common/page_state_serialization.cc b/content/common/page_state_serialization.cc
index d99830a2ce27d8d4f2308a1a2b274bc56acced41..4fbb0dae1e3a44c8136e268a4f69cf4446c777ae 100644
--- a/content/common/page_state_serialization.cc
+++ b/content/common/page_state_serialization.cc
@@ -215,7 +215,7 @@ void ReadData(SerializeObject* obj, const void** data, int* length) {
     *data = tmp;
   } else {
     obj->parse_error = true;
-    *data = NULL;
+    *data = nullptr;
     *length = 0;
   }
 }
@@ -249,7 +249,7 @@ void WriteReal(double data, SerializeObject* obj) {
 }
 
 double ReadReal(SerializeObject* obj) {
-  const void* tmp = NULL;
+  const void* tmp = nullptr;
   int length = 0;
   double value = 0.0;
   ReadData(obj, &tmp, &length);
@@ -316,21 +316,21 @@ void WriteString(const base::NullableString16& str, SerializeObject* obj) {
 }
 
 // This reads a serialized NullableString16 from obj. If a string can't be
-// read, NULL is returned.
+// read, nullptr is returned.
 const base::char16* ReadStringNoCopy(SerializeObject* obj, int* num_chars) {
   int length_in_bytes;
   if (!obj->pickle.ReadInt(&obj->iter, &length_in_bytes)) {
     obj->parse_error = true;
-    return NULL;
+    return nullptr;
   }
 
   if (length_in_bytes < 0)
-    return NULL;
+    return nullptr;
 
   const char* data;
   if (!obj->pickle.ReadBytes(&obj->iter, &data, length_in_bytes)) {
     obj->parse_error = true;
-    return NULL;
+    return nullptr;
   }
 
   if (num_chars)