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

extensions/common/permissions/manifest_permission_set_unittest.cc

 // Copyright 2013 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 "base/pickle.h"
 #include "base/values.h"
 #include "extensions/common/permissions/manifest_permission.h"
 #include "extensions/common/permissions/manifest_permission_set.h"
 #include "ipc/ipc_message.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 26 matching lines @@
 
   virtual scoped_ptr<base::Value> ToValue() const OVERRIDE {
     return make_scoped_ptr(base::Value::CreateNullValue());
   }
 
   virtual ManifestPermission* Diff(const ManifestPermission* rhs)
       const OVERRIDE {
     const MockManifestPermission* other =
         static_cast<const MockManifestPermission*>(rhs);
     EXPECT_EQ(name_, other->name_);
-    return NULL;
+    return nullptr;
   }
 
   virtual ManifestPermission* Union(const ManifestPermission* rhs)
       const OVERRIDE {
     const MockManifestPermission* other =
         static_cast<const MockManifestPermission*>(rhs);
     EXPECT_EQ(name_, other->name_);
     return new MockManifestPermission(name_);
   }
 
@@ skipping 168 matching lines @@
   EXPECT_EQ(expected_permissions, result);
 
   // |result| = |permissions1| - |permissions2| -->
   //   |result| intersect |permissions2| == empty_set
   ManifestPermissionSet result2;
   ManifestPermissionSet::Intersection(result, permissions2, &result2);
   EXPECT_TRUE(result2.empty());
 }
 
 }  // namespace extensions