Refactor menu dependency on aura/wm SetShadowType

ui/views/widget/widget.h

Index: ui/views/widget/widget.h
diff --git a/ui/views/widget/widget.h b/ui/views/widget/widget.h
index 9ade039d4a3c0e07813d7c0fceffde2d39a091c0..cd09391c0fd90c4726cbe20288e9e06af21ed8e0 100644
--- a/ui/views/widget/widget.h
+++ b/ui/views/widget/widget.h
@@ -180,6 +180,13 @@ class VIEWS_EXPORT Widget : public internal::NativeWidgetDelegate,
       WIDGET_OWNS_NATIVE_WIDGET
     };
 
+    enum ShadowType {
+      DEFAULT_SHADOW,   // Use default shadow setting.

[sky, 2014/05/20 13:30:42]

SHADOW_TYPE_DEFAULT, SHADOW_TYPE_NONE, SHADOW_TYPE_DROP (this is the common
naming style as used by content and is preferable). Also, better document what
default means.

+      NO_SHADOW,        // Don't draw any shadow.
+      DROP_SHADOW,      // Draw a drop shadow that emphasizes Z-order
+                        // relationship to other windows.
+    };
+
     InitParams();
     explicit InitParams(Type type);
     ~InitParams();
@@ -200,7 +207,7 @@ class VIEWS_EXPORT Widget : public internal::NativeWidgetDelegate,
     bool visible_on_all_workspaces;
     Ownership ownership;
     bool mirror_origin_in_rtl;
-    bool has_dropshadow;
+    ShadowType shadow_type;
     // Specifies that the system default caption and icon should not be
     // rendered, and that the client area should be equivalent to the window
     // area. Only used on some platforms (Windows and Linux).