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

extensions/browser/api_test_utils.cc

Index: extensions/browser/api_test_utils.cc
diff --git a/extensions/browser/api_test_utils.cc b/extensions/browser/api_test_utils.cc
index b96f4a6c5a95d1c2c73b1a6fe4c39dbd62c5a6cf..cd31003aa5343070d177355b9df9c1aa1ff6675c 100644
--- a/extensions/browser/api_test_utils.cc
+++ b/extensions/browser/api_test_utils.cc
@@ -35,7 +35,7 @@ base::Value* ParseJSON(const std::string& data) {
 
 base::ListValue* ParseList(const std::string& data) {
   base::Value* result = ParseJSON(data);
-  base::ListValue* list = NULL;
+  base::ListValue* list = nullptr;
   result->GetAsList(&list);
   return list;
 }
@@ -53,7 +53,7 @@ class SendResponseDelegate
     should_post_quit_ = should_quit;
   }
 
-  bool HasResponse() { return response_.get() != NULL; }
+  bool HasResponse() { return response_.get() != nullptr; }
 
   bool GetResponse() {
     EXPECT_TRUE(HasResponse());
@@ -104,12 +104,12 @@ base::Value* RunFunctionWithDelegateAndReturnSingleResult(
   RunFunction(function, args, context, dispatcher.Pass(), flags);
   EXPECT_TRUE(function->GetError().empty())
       << "Unexpected error: " << function->GetError();
-  const base::Value* single_result = NULL;
-  if (function->GetResultList() != NULL &&
+  const base::Value* single_result = nullptr;
+  if (function->GetResultList() != nullptr &&
       function->GetResultList()->Get(0, &single_result)) {
     return single_result->DeepCopy();
   }
-  return NULL;
+  return nullptr;
 }
 
 base::Value* RunFunctionAndReturnSingleResult(