Add presubmit check for scoped_ptr usage.

ui/ozone/platform/test/test_window_manager.cc

 // Copyright 2014 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 "ui/ozone/platform/test/test_window_manager.h"
 
 #include "base/bind.h"
 #include "base/files/file_util.h"
 #include "base/location.h"
 #include "base/stl_util.h"
@@ skipping 36 matching lines @@
     bitmap.setInfo(surface_->getCanvas()->imageInfo());
 
     // TODO(dnicoara) Use SkImage instead to potentially avoid a copy.
     // See crbug.com/361605 for details.
     if (surface_->getCanvas()->readPixels(&bitmap, 0, 0)) {
       base::WorkerPool::PostTask(
           FROM_HERE, base::Bind(&WriteDataToFile, location_, bitmap), true);
     }
   }
   scoped_ptr<gfx::VSyncProvider> CreateVSyncProvider() override {
-    return scoped_ptr<gfx::VSyncProvider>();
+    return nullptr;
   }
 
  private:
   base::FilePath location_;
   skia::RefPtr<SkSurface> surface_;
 };
 
 }  // namespace
 
 TestWindowManager::TestWindowManager(const base::FilePath& dump_location)
@@ skipping 33 matching lines @@
   return make_scoped_ptr<SurfaceOzoneCanvas>(new FileSurface(window->path()));
 }
 
 bool TestWindowManager::LoadEGLGLES2Bindings(
     AddGLLibraryCallback add_gl_library,
     SetGLGetProcAddressProcCallback set_gl_get_proc_address) {
   return false;
 }
 
 }  // namespace ui