Convert //chrome/browser/metrics from scoped_ptr to std::unique_ptr

chrome/browser/metrics/chrome_browser_main_extra_parts_metrics.h

 // Copyright (c) 2013 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.
 
 #ifndef CHROME_BROWSER_METRICS_CHROME_BROWSER_MAIN_EXTRA_PARTS_METRICS_H_
 #define CHROME_BROWSER_METRICS_CHROME_BROWSER_MAIN_EXTRA_PARTS_METRICS_H_
 
 #include <stdint.h>
 
+#include <memory>
+
 #include "base/compiler_specific.h"
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 #include "build/build_config.h"
 #include "chrome/browser/chrome_browser_main_extra_parts.h"
 #include "ui/gfx/display_observer.h"
 
 class ChromeBrowserMainParts;
 
 namespace chrome {
 void AddMetricsExtraParts(ChromeBrowserMainParts* main_parts);
 }
 
@@ skipping 29 matching lines @@
   void EmitDisplaysChangedMetric();
 
   // A cached value for the number of displays.
   int display_count_;
 
   // True iff |this| instance is registered as an observer of the native
   // screen.
   bool is_screen_observer_;
 
 #if defined(USE_OZONE) || defined(USE_X11)
-  scoped_ptr<ui::InputDeviceEventObserver> input_device_event_observer_;
+  std::unique_ptr<ui::InputDeviceEventObserver> input_device_event_observer_;
 #endif  // defined(USE_OZONE) || defined(USE_X11)
 
   DISALLOW_COPY_AND_ASSIGN(ChromeBrowserMainExtraPartsMetrics);
 };
 
 #endif  // CHROME_BROWSER_METRICS_CHROME_BROWSER_MAIN_EXTRA_PARTS_METRICS_H_