cros: Update rotation lock UI

ash/system/tray/tray_image_item.cc

Index: ash/system/tray/tray_image_item.cc
diff --git a/ash/system/tray/tray_image_item.cc b/ash/system/tray/tray_image_item.cc
index ca45de2fc8685bfe1dd0e0186dcfa627bee11b28..8d4b4e9dfa2c1b8842ecc53adfe7ecea5569f0db 100644
--- a/ash/system/tray/tray_image_item.cc
+++ b/ash/system/tray/tray_image_item.cc
@@ -34,7 +34,7 @@ views::View* TrayImageItem::CreateTrayView(LoginStatus status) {
   CHECK(!tray_view_);
   tray_view_ = new TrayItemView(this);
   tray_view_->CreateImageView();
-  UpdateImageOnImageView();
+  SetImageIcon(icon_);
   tray_view_->SetVisible(GetInitialVisibility());
   return tray_view_;
 }
@@ -45,15 +45,15 @@ void TrayImageItem::DestroyTrayView() {
 
 void TrayImageItem::SetIconColor(SkColor color) {
   icon_color_ = color;
-  UpdateImageOnImageView();
+  SetImageIcon(icon_);
 }
 
-void TrayImageItem::UpdateImageOnImageView() {
+void TrayImageItem::SetImageIcon(const gfx::VectorIcon& icon) {
   if (!tray_view_)
     return;
 
   tray_view_->image_view()->SetImage(
-      gfx::CreateVectorIcon(icon_, kTrayIconSize, icon_color_));
+      gfx::CreateVectorIcon(icon, kTrayIconSize, icon_color_));
 }
 
 }  // namespace ash