cros-md: Remove the non-MD immersive mode code paths

chrome/browser/ui/views/tabs/tab_strip.h

Index: chrome/browser/ui/views/tabs/tab_strip.h
diff --git a/chrome/browser/ui/views/tabs/tab_strip.h b/chrome/browser/ui/views/tabs/tab_strip.h
index 4512b4dd295d8ea1bfa3442cd59275cfa6a6f324..9c48e515252ebec9f52ec78bd31870c66d61748f 100644
--- a/chrome/browser/ui/views/tabs/tab_strip.h
+++ b/chrome/browser/ui/views/tabs/tab_strip.h
@@ -186,9 +186,6 @@ class TabStrip : public views::View,
   // Set the background offset used by inactive tabs to match the frame image.
   void SetBackgroundOffset(const gfx::Point& offset);
 
-  // Sets a painting style with miniature "tab indicator" rectangles at the top.
-  void SetImmersiveStyle(bool enable);
-
   // Returns the alpha that inactive tabs and the new tab button should use to
   // blend against the frame background.  Inactive tabs and the new tab button
   // differ in whether they change alpha when tab multiselection is occurring;
@@ -237,7 +234,6 @@ class TabStrip : public views::View,
       const base::Callback<gfx::Path(const gfx::Size&)>& border_callback,
       gfx::Path* clip) override;
   bool CanPaintThrobberToLayer() const override;
-  bool IsImmersiveStyle() const override;
   SkColor GetToolbarTopSeparatorColor() const override;
   base::string16 GetAccessibleTabName(const Tab* tab) const override;
   int GetBackgroundResourceId(bool* custom_image) const override;
@@ -261,8 +257,9 @@ class TabStrip : public views::View,
   void GetAccessibleNodeData(ui::AXNodeData* node_data) override;
   views::View* GetTooltipHandlerForPoint(const gfx::Point& point) override;
 
-  // Returns preferred height in immersive style.
-  static int GetImmersiveHeight();
+  // A set method to update whether tabstrip is on offscreen state, this could
+  // happen when browser window is in immersive fullscreen unrevealed state.
+  void set_offscreen(bool offscreen) { offscreen_ = offscreen; }
 
  private:
   typedef std::vector<Tab*> Tabs;
@@ -650,8 +647,8 @@ class TabStrip : public views::View,
   // tab close comes from a touch device.
   base::OneShotTimer resize_layout_timer_;
 
-  // True if tabs are painted as rectangular light-bars.
-  bool immersive_style_;
+  // True if tabstrip is completely offscreen, otherwise false.
+  bool offscreen_;
 
   // Our observers.
   typedef base::ObserverList<TabStripObserver> TabStripObservers;