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

extensions/common/permissions/api_permission_set.cc

Index: extensions/common/permissions/api_permission_set.cc
diff --git a/extensions/common/permissions/api_permission_set.cc b/extensions/common/permissions/api_permission_set.cc
index d21ab439dea801adbc71857552e72ff23e562839..dd75242c114b470e67cf1fa14ff4bddd20e8cd11 100644
--- a/extensions/common/permissions/api_permission_set.cc
+++ b/extensions/common/permissions/api_permission_set.cc
@@ -106,15 +106,18 @@ bool ParseChildPermissions(const std::string& base_name,
         continue;
       }
 
-      if (!CreateAPIPermission(
-              base_name + '.' + permission_str, NULL, source,
-              api_permissions, error, unhandled_permissions))
+      if (!CreateAPIPermission(base_name + '.' + permission_str,
+                               nullptr,
+                               source,
+                               api_permissions,
+                               error,
+                               unhandled_permissions))
         return false;
     }
   }
 
-  return CreateAPIPermission(base_name, NULL, source,
-                             api_permissions, error, NULL);
+  return CreateAPIPermission(
+      base_name, nullptr, source, api_permissions, error, nullptr);
 }
 
 }  // namespace
@@ -139,9 +142,9 @@ bool APIPermissionSet::ParseFromJSON(
     std::vector<std::string>* unhandled_permissions) {
   for (size_t i = 0; i < permissions->GetSize(); ++i) {
     std::string permission_str;
-    const base::Value* permission_value = NULL;
+    const base::Value* permission_value = nullptr;
     if (!permissions->GetString(i, &permission_str)) {
-      const base::DictionaryValue* dict = NULL;
+      const base::DictionaryValue* dict = nullptr;
       // permission should be a string or a single key dict.
       if (!permissions->GetDictionary(i, &dict) || dict->size() != 1) {
         if (error) {