Re-enable PRESUBMIT check for empty unique_ptr<> rvalue

ui/display/chromeos/display_configurator_unittest.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/display/chromeos/display_configurator.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include "base/macros.h"
@@ skipping 209 matching lines @@
       outputs.push_back(&outputs_[i]);
     native_display_delegate_->set_outputs(outputs);
 
     if (send_events) {
       configurator_.OnConfigurationChanged();
       EXPECT_TRUE(test_api_.TriggerConfigureTimeout());
     }
   }
 
   void Init(bool panel_fitting_enabled) {
-    configurator_.Init(std::unique_ptr<NativeDisplayDelegate>(),
-                       panel_fitting_enabled);
+    configurator_.Init(nullptr, panel_fitting_enabled);
   }
 
   // Initializes |configurator_| with a single internal display.
   void InitWithSingleOutput() {
     UpdateOutputs(1, false);
     EXPECT_EQ(kNoActions, log_->GetActionsAndClear());
-    configurator_.Init(std::unique_ptr<NativeDisplayDelegate>(), false);
+    configurator_.Init(nullptr, false);
 
     EXPECT_EQ(kNoActions, log_->GetActionsAndClear());
     configurator_.ForceInitialConfigure(0);
     EXPECT_EQ(JoinActions(kInitXRandR, kGrab,
                           GetFramebufferAction(small_mode_.size(), &outputs_[0],
                                                NULL).c_str(),
                           GetCrtcAction(outputs_[0], &small_mode_,
                                         gfx::Point(0, 0)).c_str(),
                           kForceDPMS, kUngrab, NULL),
               log_->GetActionsAndClear());
@@ skipping 1704 matching lines @@
           GetCrtcAction(outputs_[1], &big_mode_,
                         gfx::Point(0, small_mode_.size().height() +
                                           DisplayConfigurator::kVerticalGap))
               .c_str(),
           kUngrab, NULL),
       log_->GetActionsAndClear());
 }
 
 }  // namespace test
 }  // namespace ui