Remove unused references to NativeTheme in TrayPopupItemStyle.

ash/common/system/tray/tray_popup_item_style.h

 // Copyright 2016 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 ASH_COMMON_SYSTEM_TRAY_TRAY_POPUP_ITEM_STYLE_H_
 #define ASH_COMMON_SYSTEM_TRAY_TRAY_POPUP_ITEM_STYLE_H_
 
 #include "base/macros.h"
 #include "third_party/skia/include/core/SkColor.h"
 
-namespace ui {
-class NativeTheme;
-}  // namespace ui
-
 namespace views {
 class Label;
 }  // namespace views
 
 namespace ash {
 
 // Central style provider for the system tray menu. Makes it easier to ensure
 // all visuals are consistent and easily updated in one spot instead of being
 // defined in multiple places throughout the code.
-//
-// Since the TrayPopupItemStyle is based on a NativeTheme you should ensure that
-// when a View's theme changes that a style is re-applied using the new theme.
-// Typically this is done by overriding View::OnNativeThemeChanged() as shown
-// below.
-//
-// It is also important to note that Views call through the virtual function
-// View::GetWidget() when obtaining the NativeTheme. Therefore, Views should not
-// be getting the theme in their own constructors. See https://crbug.com/647376.
-//
-// Example:
-//   void OnNativeThemeChanged(const ui::NativeTheme* theme) override {
-//     UpdateStyle();
-//   }
-//
-//   void UpdateStyle() {
-//     TrayPopupItemStyle style(GetNativeTheme());
-//     style.SetupLabel(label_);
-//   }
 class TrayPopupItemStyle {
  public:
   // The different visual styles that a row can have.
   enum class ColorStyle {
     // Active and clickable.
     ACTIVE,
     // Inactive but clickable.
     INACTIVE,
     // Disabled and not clickable.
     DISABLED,
     // Color for "Connected" labels.
     CONNECTED,
-    // Color for sub-section header rows in detailed views.
-    SUB_HEADER,
   };
 
   // The different font styles that row text can have.
   enum class FontStyle {
     // Topmost header rows for default view and detailed view.
     TITLE,
     // Main text used by default view rows.
     DEFAULT_VIEW_LABEL,
     // Text in sub-section header rows in detailed views.
     SUB_HEADER,
     // Main text used by detailed view rows.
     DETAILED_VIEW_LABEL,
     // System information text (e.g. date/time, battery status, etc).
     SYSTEM_INFO,
     // Child buttons within rows that have a visible border (e.g. Cast's
     // "Stop", etc).
     BUTTON,
     // Sub text within a row (e.g. user name in user row).
     CAPTION,
   };
 
-  static SkColor GetIconColor(const ui::NativeTheme* theme,
-                              ColorStyle color_style);
   static SkColor GetIconColor(ColorStyle color_style);
 
-  TrayPopupItemStyle(const ui::NativeTheme* theme, FontStyle font_style);
   explicit TrayPopupItemStyle(FontStyle font_style);
   ~TrayPopupItemStyle();
 
-  const ui::NativeTheme* theme() const { return theme_; }
-
-  void set_theme(const ui::NativeTheme* theme) { theme_ = theme; }
-
   ColorStyle color_style() const { return color_style_; }
 
   void set_color_style(ColorStyle color_style) { color_style_ = color_style; }
 
   FontStyle font_style() const { return font_style_; }
 
   void set_font_style(FontStyle font_style) { font_style_ = font_style; }
 
   SkColor GetTextColor() const;
 
   SkColor GetIconColor() const;
 
   // Configures a Label as per the style (e.g. color, font).
   void SetupLabel(views::Label* label) const;
 
  private:
-  // The theme that the styles are dervied from.
-  // NOTE the styles are not currently derived from |theme_| but see TODO below.
-  // TODO(bruthig|tdanderson): Determine if TrayPopupItemStyle should depend on
-  // a NativeTheme. See http://crbug.com/665891.
-  const ui::NativeTheme* theme_;
-
   FontStyle font_style_;
 
   ColorStyle color_style_;
 
   DISALLOW_COPY_AND_ASSIGN(TrayPopupItemStyle);
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_SYSTEM_TRAY_TRAY_POPUP_ITEM_STYLE_H_