Use a single views::MenuConfig instance for each platform

chrome/browser/ui/views/content_setting_bubble_contents.h

Index: chrome/browser/ui/views/content_setting_bubble_contents.h
diff --git a/chrome/browser/ui/views/content_setting_bubble_contents.h b/chrome/browser/ui/views/content_setting_bubble_contents.h
index 62968a464e258115e27df4b010678d2274e72dfc..c6bc6360f98e0bfbc989b0baf05d844769a5b7de 100644
--- a/chrome/browser/ui/views/content_setting_bubble_contents.h
+++ b/chrome/browser/ui/views/content_setting_bubble_contents.h
@@ -76,9 +76,6 @@ class ContentSettingBubbleContents : public content::WebContentsObserver,
       const content::LoadCommittedDetails& details,
       const content::FrameNavigateParams& params) override;
 
-  // views::View:
-  void OnNativeThemeChanged(const ui::NativeTheme* theme) override;
-
   // views::ButtonListener:
   void ButtonPressed(views::Button* sender, const ui::Event& event) override;
 
@@ -90,7 +87,7 @@ class ContentSettingBubbleContents : public content::WebContentsObserver,
                            const gfx::Point& point) override;
 
   // Helper to get the preferred width of the media menu.
-  void UpdateMenuButtonSizes(const ui::NativeTheme* theme);
+  void UpdateMenuButtonSizes();
 
   // Provides data for this bubble.
   scoped_ptr<ContentSettingBubbleModel> content_setting_bubble_model_;