Make the size of menulists on Linux the same size as on Windows.

ui/gfx/native_theme_linux.h

Index: ui/gfx/native_theme_linux.h
diff --git a/ui/gfx/native_theme_linux.h b/ui/gfx/native_theme_linux.h
index b557dfc82138dafdf6065e84f7edad0ee0e6d779..5bd9a2810c44973bcbe61e7161dacfb630a0a673 100644
--- a/ui/gfx/native_theme_linux.h
+++ b/ui/gfx/native_theme_linux.h
@@ -60,6 +60,7 @@ class NativeThemeLinux {
     bool checked;
     bool indeterminate;  // Whether the button state is indeterminate.
     bool is_default;     // Whether the button is default button.
+    bool has_border;
     SkColor background_color;
   };
 
@@ -70,6 +71,8 @@ class NativeThemeLinux {
   };
 
   struct MenuListExtraParams {
+    bool has_border;
+    bool has_border_radius;
     int arrow_x;
     int arrow_y;
     SkColor background_color;