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

ui/gfx/native_theme_linux.h

 // Copyright (c) 2011 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 UI_GFX_NATIVE_THEME_LINUX_H_
 #define UI_GFX_NATIVE_THEME_LINUX_H_
 
 #include "base/basictypes.h"
 #include "skia/ext/platform_canvas.h"
 
@@ skipping 42 matching lines @@
     int track_x;
     int track_y;
     int track_width;
     int track_height;
   };
 
   struct ButtonExtraParams {
     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;
   };
 
   struct TextFieldExtraParams {
     bool is_text_area;
     bool is_listbox;
     SkColor background_color;
   };
 
   struct MenuListExtraParams {
+    bool has_border;
     int arrow_x;
     int arrow_y;
     SkColor background_color;
   };
 
   struct SliderExtraParams {
     bool vertical;
     bool in_drag;
   };
 
@@ skipping 146 matching lines @@
   static unsigned int thumb_inactive_color_;
   static unsigned int thumb_active_color_;
   static unsigned int track_color_;
 
   DISALLOW_COPY_AND_ASSIGN(NativeThemeLinux);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_NATIVE_THEME_LINUX_H_