[ash-md] Makes Wi-Fi header row sticky when network list is scrolled

ash/common/system/tray/tray_details_view.h

Index: ash/common/system/tray/tray_details_view.h
diff --git a/ash/common/system/tray/tray_details_view.h b/ash/common/system/tray/tray_details_view.h
index 5cb4e4a3754162a6265cf3090d3d2961ae6c527c..7b4ace783b91e9304ee1d1c48aab62b604cca79d 100644
--- a/ash/common/system/tray/tray_details_view.h
+++ b/ash/common/system/tray/tray_details_view.h
@@ -6,6 +6,7 @@
 #define ASH_COMMON_SYSTEM_TRAY_TRAY_DETAILS_VIEW_H_
 
 #include "ash/ash_export.h"
+#include "ash/common/system/tray/header_list_scroll_view.h"
 #include "ash/common/system/tray/special_popup_row.h"
 #include "ash/common/system/tray/view_click_listener.h"
 #include "base/macros.h"
@@ -42,7 +43,7 @@ class ASH_EXPORT TrayDetailsView : public views::View,
   SystemTrayItem* owner() { return owner_; }
   SpecialPopupRow* title_row() { return title_row_; }
   FixedSizedScrollView* scroller() { return scroller_; }
-  views::View* scroll_content() { return scroll_content_; }
+  HeaderListScrollView* scroll_content() { return scroll_content_; }
   views::ProgressBar* progress_bar() { return progress_bar_; }
 
  protected:
@@ -90,7 +91,7 @@ class ASH_EXPORT TrayDetailsView : public views::View,
   SystemTrayItem* owner_;
   SpecialPopupRow* title_row_;
   FixedSizedScrollView* scroller_;
-  views::View* scroll_content_;
+  HeaderListScrollView* scroll_content_;
   views::ProgressBar* progress_bar_;
 
   // |title_row_separator_| has a views::Separator as a child and, optionally,