[Password Manager Cleanup] Replaces NULL -> nullptr.

components/password_manager/core/browser/affiliation_backend_unittest.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/password_manager/core/browser/affiliation_backend.h"
 
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
@@ skipping 106 matching lines @@
   }
 
   ScopedFakeAffiliationAPI* fake_affiliation_api() {
     return &fake_affiliation_api_;
   }
 
  private:
   // testing::Test:
   void SetUp() override {
     clock_->Advance(base::TimeDelta::FromMicroseconds(1));
-    backend_.reset(new AffiliationBackend(NULL, make_scoped_ptr(clock_)));
+    backend_.reset(new AffiliationBackend(nullptr, make_scoped_ptr(clock_)));
 
     base::FilePath database_path;
     ASSERT_TRUE(CreateTemporaryFile(&database_path));
     backend_->Initialize(database_path);
 
     fake_affiliation_api_.AddTestEquivalenceClass(
         GetTestEquivalenceClassAlpha());
     fake_affiliation_api_.AddTestEquivalenceClass(
         GetTestEquivalenceClassBeta());
     fake_affiliation_api_.AddTestEquivalenceClass(
@@ skipping 171 matching lines @@
   // Currently, a GetAffiliations() request can only be blocked due to fetch in
   // flight -- so emulate this condition when destroying the backend.
   fake_affiliation_api()->IgnoreNextRequest();
   DestroyBackend();
   mock_consumer()->ExpectFailure();
   consumer_task_runner()->RunUntilIdle();
   testing::Mock::VerifyAndClearExpectations(mock_consumer());
 }
 
 }  // namespace password_manager