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

chrome/browser/ui/native_window_tracker.h

Index: chrome/browser/ui/native_window_tracker.h
diff --git a/chrome/browser/ui/native_window_tracker.h b/chrome/browser/ui/native_window_tracker.h
index c08dc126546b766861acc8cecc5d0097a5f93d28..9705e285c8271b65c508c0d5da434c3cb31c4bf7 100644
--- a/chrome/browser/ui/native_window_tracker.h
+++ b/chrome/browser/ui/native_window_tracker.h
@@ -5,7 +5,8 @@
 #ifndef CHROME_BROWSER_UI_NATIVE_WINDOW_TRACKER_H_
 #define CHROME_BROWSER_UI_NATIVE_WINDOW_TRACKER_H_
 
-#include "base/memory/scoped_ptr.h"
+#include <memory>
+
 #include "ui/gfx/native_widget_types.h"
 
 // An observer which detects when a gfx::NativeWindow is closed.
@@ -13,7 +14,7 @@ class NativeWindowTracker {
  public:
   virtual ~NativeWindowTracker() {}
 
-  static scoped_ptr<NativeWindowTracker> Create(gfx::NativeWindow window);
+  static std::unique_ptr<NativeWindowTracker> Create(gfx::NativeWindow window);
 
   // Returns true if the native window passed to Create() has been closed.
   virtual bool WasNativeWindowClosed() const = 0;