Add presubmit check for scoped_ptr usage.

ui/ozone/platform/caca/caca_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/caca/caca_window_manager.h"
 
 #include "base/debug/trace_event.h"
 #include "third_party/skia/include/core/SkCanvas.h"
 #include "third_party/skia/include/core/SkSurface.h"
 #include "ui/gfx/skia_util.h"
@@ skipping 82 matching lines @@
                      0,
                      0,
                      caca_get_canvas_width(canvas),
                      caca_get_canvas_height(canvas),
                      dither_.get(),
                      static_cast<const uint8_t*>(pixels));
   caca_refresh_display(window_->display());
 }
 
 scoped_ptr<gfx::VSyncProvider> CacaSurface::CreateVSyncProvider() {
-  return scoped_ptr<gfx::VSyncProvider>();
+  return nullptr;
 }
 
 }  // namespace
 
 CacaWindowManager::CacaWindowManager() {
 }
 
 int32_t CacaWindowManager::AddWindow(CacaWindow* window) {
   return windows_.Add(window);
 }
@@ skipping 17 matching lines @@
   CacaWindow* window = windows_.Lookup(widget);
   DCHECK(window);
 
   scoped_ptr<CacaSurface> canvas(new CacaSurface(window));
   bool initialized = canvas->Initialize();
   DCHECK(initialized);
   return canvas.Pass();
 }
 
 }  // namespace ui