Remove all uses of skia::RefPtr and stale includes

ui/ozone/platform/drm/gpu/mock_dumb_buffer_generator.cc

 // Copyright 2015 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/drm/gpu/mock_dumb_buffer_generator.h"
 
+#include "third_party/skia/include/core/SkImageInfo.h"
 #include "ui/ozone/platform/drm/gpu/drm_buffer.h"
 
 namespace ui {
 
 MockDumbBufferGenerator::MockDumbBufferGenerator() {}
 
 MockDumbBufferGenerator::~MockDumbBufferGenerator() {}
 
 scoped_refptr<ScanoutBuffer> MockDumbBufferGenerator::Create(
     const scoped_refptr<DrmDevice>& drm,
     gfx::BufferFormat format,
     const gfx::Size& size) {
   scoped_refptr<DrmBuffer> buffer(new DrmBuffer(drm));
   SkImageInfo info = SkImageInfo::MakeN32Premul(size.width(), size.height());
   if (!buffer->Initialize(info, true /* should_register_framebuffer */))
     return NULL;
 
   return buffer;
 }
 
 }  // namespace ui