Fix more uses of T* conversion operator from scoped_refptr<T> which is now removed

ui/ozone/platform/dri/gbm_surface_factory.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/dri/gbm_surface_factory.h"
 
 #include <gbm.h>
 
 #include "base/command_line.h"
 #include "base/files/file_path.h"
@@ skipping 156 matching lines @@
 
   DriWindowDelegate* delegate = GetOrCreateWindowDelegate(widget);
   return scoped_ptr<SurfaceOzoneEGL>(new GbmSurfaceless(delegate));
 }
 
 scoped_refptr<ui::NativePixmap> GbmSurfaceFactory::CreateNativePixmap(
     gfx::Size size,
     BufferFormat format) {
   scoped_refptr<GbmBuffer> buffer = GbmBuffer::CreateBuffer(
       drm_, device_, format, size, true);
-  if (!buffer)
+  if (!buffer.get())
     return NULL;
 
   return scoped_refptr<GbmPixmap>(new GbmPixmap(buffer));
 }
 
 OverlayCandidatesOzone* GbmSurfaceFactory::GetOverlayCandidates(
     gfx::AcceleratedWidget w) {
   if (CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kOzoneTestSingleOverlaySupport))
     return new SingleOverlay();
   return NULL;
 }
 
 bool GbmSurfaceFactory::ScheduleOverlayPlane(
     gfx::AcceleratedWidget widget,
     int plane_z_order,
     gfx::OverlayTransform plane_transform,
     scoped_refptr<NativePixmap> buffer,
     const gfx::Rect& display_bounds,
     const gfx::RectF& crop_rect) {
   scoped_refptr<GbmPixmap> pixmap = static_cast<GbmPixmap*>(buffer.get());
-  if (!pixmap) {
+  if (!pixmap.get()) {
     LOG(ERROR) << "ScheduleOverlayPlane passed NULL buffer.";
     return false;
   }
   HardwareDisplayController* hdc =
       window_manager_->GetWindowDelegate(widget)->GetController();
   if (!hdc)
     return true;
 
   hdc->QueueOverlayPlane(OverlayPlane(pixmap->buffer(),
                                       plane_z_order,
@@ skipping 13 matching lines @@
     scoped_ptr<DriWindowDelegate> delegate(
         new DriWindowDelegateImpl(widget, screen_manager_));
     delegate->Initialize();
     window_manager_->AddWindowDelegate(widget, delegate.Pass());
   }
 
   return window_manager_->GetWindowDelegate(widget);
 }
 
 }  // namespace ui