Make various views SetShape() methods take an unique_ptr.

ui/views/widget/native_widget_mac.h

Index: ui/views/widget/native_widget_mac.h
diff --git a/ui/views/widget/native_widget_mac.h b/ui/views/widget/native_widget_mac.h
index 08ff8c301c269c6865f75b02d531141a9d5388c3..9ee685581e48d82f980780ec1c04c217799dc644 100644
--- a/ui/views/widget/native_widget_mac.h
+++ b/ui/views/widget/native_widget_mac.h
@@ -25,7 +25,7 @@ class BridgedNativeWidget;
 
 class VIEWS_EXPORT NativeWidgetMac : public internal::NativeWidgetPrivate {
  public:
-  NativeWidgetMac(internal::NativeWidgetDelegate* delegate);
+  explicit NativeWidgetMac(internal::NativeWidgetDelegate* delegate);
   ~NativeWidgetMac() override;
 
   // Retrieves the bridge associated with the given NSWindow. Returns null if
@@ -84,7 +84,7 @@ class VIEWS_EXPORT NativeWidgetMac : public internal::NativeWidgetPrivate {
   void StackAbove(gfx::NativeView native_view) override;
   void StackAtTop() override;
   void StackBelow(gfx::NativeView native_view) override;
-  void SetShape(SkRegion* shape) override;
+  void SetShape(std::unique_ptr<SkRegion> shape) override;
   void Close() override;
   void CloseNow() override;
   void Show() override;