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

extensions/common/manifest_handlers/nacl_modules_handler.cc

Index: extensions/common/manifest_handlers/nacl_modules_handler.cc
diff --git a/extensions/common/manifest_handlers/nacl_modules_handler.cc b/extensions/common/manifest_handlers/nacl_modules_handler.cc
index 6715b2e4133ac2e85d333602cc03729b38026ccc..61125d640ba934473a383fcc554bdd2c66660820 100644
--- a/extensions/common/manifest_handlers/nacl_modules_handler.cc
+++ b/extensions/common/manifest_handlers/nacl_modules_handler.cc
@@ -31,7 +31,7 @@ const NaClModuleInfo::List* NaClModuleInfo::GetNaClModules(
     const Extension* extension) {
   NaClModuleData* data = static_cast<NaClModuleData*>(
       extension->GetManifestData(keys::kNaClModules));
-  return data ? &data->nacl_modules_ : NULL;
+  return data ? &data->nacl_modules_ : nullptr;
 }
 
 NaClModulesHandler::NaClModulesHandler() {
@@ -41,7 +41,7 @@ NaClModulesHandler::~NaClModulesHandler() {
 }
 
 bool NaClModulesHandler::Parse(Extension* extension, base::string16* error) {
-  const base::ListValue* list_value = NULL;
+  const base::ListValue* list_value = nullptr;
   if (!extension->manifest()->GetList(keys::kNaClModules, &list_value)) {
     *error = base::ASCIIToUTF16(errors::kInvalidNaClModules);
     return false;
@@ -50,7 +50,7 @@ bool NaClModulesHandler::Parse(Extension* extension, base::string16* error) {
   scoped_ptr<NaClModuleData> nacl_module_data(new NaClModuleData);
 
   for (size_t i = 0; i < list_value->GetSize(); ++i) {
-    const base::DictionaryValue* module_value = NULL;
+    const base::DictionaryValue* module_value = nullptr;
     if (!list_value->GetDictionary(i, &module_value)) {
       *error = base::ASCIIToUTF16(errors::kInvalidNaClModules);
       return false;