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

extensions/browser/api/app_current_window_internal/app_current_window_internal_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_current_window_internal/app_current_window_internal_api.h"
 
 #include "base/command_line.h"
 #include "extensions/browser/app_window/app_window.h"
 #include "extensions/browser/app_window/app_window_client.h"
 #include "extensions/browser/app_window/app_window_registry.h"
@@ skipping 357 matching lines @@
       const RegionRect& inputRect = **i;
       int32_t x = inputRect.left;
       int32_t y = inputRect.top;
       int32_t width = inputRect.width;
       int32_t height = inputRect.height;
 
       SkIRect rect = SkIRect::MakeXYWH(x, y, width, height);
       region->op(rect, SkRegion::kUnion_Op);
     }
   } else {
-    region.reset(NULL);
+    region.reset(nullptr);
   }
 
   window->UpdateShape(region.Pass());
 
   return true;
 }
 
 bool AppCurrentWindowInternalSetAlwaysOnTopFunction::RunWithWindow(
     AppWindow* window) {
   if (!extension()->permissions_data()->HasAPIPermission(
@@ skipping 17 matching lines @@
   }
 
   scoped_ptr<SetVisibleOnAllWorkspaces::Params> params(
       SetVisibleOnAllWorkspaces::Params::Create(*args_));
   CHECK(params.get());
   window->GetBaseWindow()->SetVisibleOnAllWorkspaces(params->always_visible);
   return true;
 }
 
 }  // namespace extensions