Introduce system_info as an independent container.

athena/system/background_controller.cc

Index: athena/system/background_controller.cc
diff --git a/athena/system/background_controller.cc b/athena/system/background_controller.cc
index 67b0b7f017e245829fb3b7eafb535130288d72ee..cb90405120385ce3b6ad9271fd442f821b540ed7 100644
--- a/athena/system/background_controller.cc
+++ b/athena/system/background_controller.cc
@@ -17,11 +17,7 @@ namespace athena {
 
 class BackgroundView : public views::View {
  public:
-  BackgroundView() : system_info_view_(nullptr) {
-    system_info_view_ =
-        SystemUI::Get()->CreateSystemInfoView(SystemUI::COLOR_SCHEME_LIGHT);
-    AddChildView(system_info_view_);
-  }
+  BackgroundView() {}
   ~BackgroundView() override {}
 
   void SetImage(const gfx::ImageSkia& image) {
@@ -30,11 +26,6 @@ class BackgroundView : public views::View {
   }
 
   // views::View:
-  virtual void Layout() override {
-    system_info_view_->SetBounds(
-        0, 0, width(), system_info_view_->GetPreferredSize().height());
-  }
-
   virtual void OnPaint(gfx::Canvas* canvas) override {
     canvas->DrawImageInt(image_,
                          0,
@@ -50,7 +41,6 @@ class BackgroundView : public views::View {
 
  private:
   gfx::ImageSkia image_;
-  views::View* system_info_view_;
 
   DISALLOW_COPY_AND_ASSIGN(BackgroundView);
 };