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

chrome/browser/ui/views/frame/browser_non_client_frame_view_mus.h

Index: chrome/browser/ui/views/frame/browser_non_client_frame_view_mus.h
diff --git a/chrome/browser/ui/views/frame/browser_non_client_frame_view_mus.h b/chrome/browser/ui/views/frame/browser_non_client_frame_view_mus.h
index b25f59b4790a32ea5f42f848713341e334f37528..dcf927f080986657bed1e7df7a4cd0ce66bb6375 100644
--- a/chrome/browser/ui/views/frame/browser_non_client_frame_view_mus.h
+++ b/chrome/browser/ui/views/frame/browser_non_client_frame_view_mus.h
@@ -77,10 +77,8 @@ class BrowserNonClientFrameViewMus : public BrowserNonClientFrameView,
   // strip.
   int GetTabStripRightInset() const;
 
-  // Returns true if we should use a super short header with light bars instead
-  // of regular tabs. This header is used in immersive fullscreen when the
-  // top-of-window views are not revealed.
-  bool UseImmersiveLightbarHeaderStyle() const;
+  // Returns true if immersive mode is enabled and not revealed.
+  bool IsImmersiveFullscreenUnrevealed() const;
 
   // Returns true if the header should be painted so that it looks the same as
   // the header used for packaged apps. Packaged apps use a different color
@@ -97,10 +95,6 @@ class BrowserNonClientFrameViewMus : public BrowserNonClientFrameView,
   // need their frames painted.
   bool ShouldPaint() const;
 
-  // Paints the header background when the frame is in immersive fullscreen and
-  // tab light bar is visible.
-  void PaintImmersiveLightbarStyleHeader(gfx::Canvas* canvas);
-
   void PaintToolbarBackground(gfx::Canvas* canvas);
 
   // Draws the line under the header for windows without a toolbar and not using