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

extensions/browser/api/app_window/app_window_api.cc

 // Copyright (c) 2012 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 "extensions/browser/api/app_window/app_window_api.h"
 
 #include "base/command_line.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
 #include "base/time/time.h"
@@ skipping 58 matching lines @@
 // If the same property is specified for the inner and outer bounds, raise an
 // error.
 bool CheckBoundsConflict(const scoped_ptr<int>& inner_property,
                          const scoped_ptr<int>& outer_property,
                          const std::string& property_name,
                          std::string* error) {
   if (inner_property.get() && outer_property.get()) {
     std::vector<std::string> subst;
     subst.push_back(property_name);
     *error = ReplaceStringPlaceholders(
-        app_window_constants::kConflictingBoundsOptions, subst, NULL);
+        app_window_constants::kConflictingBoundsOptions, subst, nullptr);
     return false;
   }
 
   return true;
 }
 
 // Copy over the bounds specification properties from the API to the
 // AppWindow::CreateParams.
 void CopyBoundsSpec(const app_window::BoundsSpecification* input_spec,
                     AppWindow::BoundsSpecification* create_spec) {
@@ skipping 414 matching lines @@
 
   if (options.frame->as_frame_options->inactive_color.get()) {
     error_ = app_window_constants::kInactiveColorWithoutColor;
     return false;
   }
 
   return true;
 }
 
 }  // namespace extensions