Use a single views::MenuConfig instance for each platform

chrome/browser/ui/views/content_setting_bubble_contents.cc

Index: chrome/browser/ui/views/content_setting_bubble_contents.cc
diff --git a/chrome/browser/ui/views/content_setting_bubble_contents.cc b/chrome/browser/ui/views/content_setting_bubble_contents.cc
index 54e273abdfe6254e10c5d002fc88f0b15b1b022d..7cdc6b0f3bf2e2d8ae9e55d1def3b740f37b5b9d 100644
--- a/chrome/browser/ui/views/content_setting_bubble_contents.cc
+++ b/chrome/browser/ui/views/content_setting_bubble_contents.cc
@@ -337,7 +337,7 @@ void ContentSettingBubbleContents::Init() {
     }
   }
 
-  UpdateMenuButtonSizes(GetNativeTheme());
+  UpdateMenuButtonSizes();
 
   const gfx::FontList& domain_font =
       ui::ResourceBundle::GetSharedInstance().GetFontList(
@@ -409,12 +409,6 @@ void ContentSettingBubbleContents::DidNavigateMainFrame(
   GetWidget()->Close();
 }
 
-void ContentSettingBubbleContents::OnNativeThemeChanged(
-    const ui::NativeTheme* theme) {
-  views::BubbleDelegateView::OnNativeThemeChanged(theme);
-  UpdateMenuButtonSizes(theme);
-}
-
 void ContentSettingBubbleContents::ButtonPressed(views::Button* sender,
                                                  const ui::Event& event) {
   RadioGroup::const_iterator i(
@@ -472,9 +466,8 @@ void ContentSettingBubbleContents::OnMenuButtonClicked(
                                 ui::MENU_SOURCE_NONE));
 }
 
-void ContentSettingBubbleContents::UpdateMenuButtonSizes(
-    const ui::NativeTheme* theme) {
-  const views::MenuConfig config = views::MenuConfig(theme);
+void ContentSettingBubbleContents::UpdateMenuButtonSizes() {
+  const views::MenuConfig& config = views::MenuConfig::instance();
   const int margins = config.item_left_margin + config.check_width +
                       config.label_to_arrow_padding + config.arrow_width +
                       config.arrow_to_edge_padding;