Materialized the font/icon color for some default rows in the system menu.

ash/common/system/tray/tray_popup_item_style.cc

Index: ash/common/system/tray/tray_popup_item_style.cc
diff --git a/ash/common/system/tray/tray_popup_item_style.cc b/ash/common/system/tray/tray_popup_item_style.cc
index fba33136a2241e1523b7a27a60de257d8c481f71..41536deda63c6d4a1eaa78b10570c46a07a52e96 100644
--- a/ash/common/system/tray/tray_popup_item_style.cc
+++ b/ash/common/system/tray/tray_popup_item_style.cc
@@ -4,7 +4,6 @@
 
 #include "ash/common/system/tray/tray_popup_item_style.h"
 
-#include "ash/common/system/tray/tray_popup_item_style_observer.h"
 #include "third_party/skia/include/core/SkColor.h"
 #include "ui/gfx/font.h"
 #include "ui/gfx/font_list.h"
@@ -28,30 +27,6 @@ TrayPopupItemStyle::TrayPopupItemStyle(const ui::NativeTheme* theme,
 
 TrayPopupItemStyle::~TrayPopupItemStyle() {}
 
-void TrayPopupItemStyle::AddObserver(TrayPopupItemStyleObserver* observer) {
-  if (!observers_.HasObserver(observer))
-    observers_.AddObserver(observer);
-}
-
-void TrayPopupItemStyle::RemoveObserver(TrayPopupItemStyleObserver* observer) {
-  observers_.RemoveObserver(observer);
-}
-
-void TrayPopupItemStyle::SetTheme(const ui::NativeTheme* theme) {
-  theme_ = theme;
-  NotifyObserversStyleUpdated();
-}
-
-void TrayPopupItemStyle::SetColorStyle(ColorStyle color_style) {
-  color_style_ = color_style;
-  NotifyObserversStyleUpdated();
-}
-
-void TrayPopupItemStyle::SetFontStyle(FontStyle font_style) {
-  font_style_ = font_style;
-  NotifyObserversStyleUpdated();
-}
-
 SkColor TrayPopupItemStyle::GetForegroundColor() const {
   switch (color_style_) {
     case ColorStyle::ACTIVE:
@@ -97,9 +72,4 @@ void TrayPopupItemStyle::SetupLabel(views::Label* label) const {
   }
 }
 
-void TrayPopupItemStyle::NotifyObserversStyleUpdated() {
-  FOR_EACH_OBSERVER(TrayPopupItemStyleObserver, observers_,
-                    OnTrayPopupItemStyleUpdated());
-}
-
 }  // namespace ash