Convert FieldTrialList to Accept a std::unique_ptr

components/safe_browsing_db/remote_database_manager_unittest.cc

Index: components/safe_browsing_db/remote_database_manager_unittest.cc
diff --git a/components/safe_browsing_db/remote_database_manager_unittest.cc b/components/safe_browsing_db/remote_database_manager_unittest.cc
index b6e337935bbebf82b16dbc86ed39b6b09a15e223..284b3358c888424cfabf7a369f54fc56110667b3 100644
--- a/components/safe_browsing_db/remote_database_manager_unittest.cc
+++ b/components/safe_browsing_db/remote_database_manager_unittest.cc
@@ -29,7 +29,8 @@ class TestSafeBrowsingApiHandler : public SafeBrowsingApiHandler {
 
 class RemoteDatabaseManagerTest : public testing::Test {
  protected:
-  RemoteDatabaseManagerTest() : field_trials_(new base::FieldTrialList(NULL)) {}
+  RemoteDatabaseManagerTest()
+      : field_trials_(new base::FieldTrialList(nullptr)) {}
 
   void SetUp() override {
     SafeBrowsingApiHandler::SetInstance(&api_handler_);
@@ -41,7 +42,7 @@ class RemoteDatabaseManagerTest : public testing::Test {
     // Destroy the existing FieldTrialList before creating a new one to avoid
     // a DCHECK.
     field_trials_.reset();
-    field_trials_.reset(new base::FieldTrialList(NULL));
+    field_trials_.reset(new base::FieldTrialList(nullptr));
     variations::testing::ClearAllVariationIDs();
     variations::testing::ClearAllVariationParams();