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

chrome/browser/ui/views/frame/immersive_mode_controller_ash_unittest.cc

Index: chrome/browser/ui/views/frame/immersive_mode_controller_ash_unittest.cc
diff --git a/chrome/browser/ui/views/frame/immersive_mode_controller_ash_unittest.cc b/chrome/browser/ui/views/frame/immersive_mode_controller_ash_unittest.cc
index 9fb9c7aaef9e31da74379daba953261b423ea0ac..d93e266bfee26e243ff7d81de06e83aa4f3308c8 100644
--- a/chrome/browser/ui/views/frame/immersive_mode_controller_ash_unittest.cc
+++ b/chrome/browser/ui/views/frame/immersive_mode_controller_ash_unittest.cc
@@ -138,6 +138,8 @@ TEST_F(ImmersiveModeControllerAshTest, Layout) {
       ash::MaterialDesignController::IsImmersiveModeMaterial();
   if (!is_using_material_design)
     EXPECT_TRUE(tabstrip->IsImmersiveStyle());
+  // Top container view should be completely offscreen.
+  EXPECT_EQ(0, GetBoundsInWidget(browser_view()->top_container()).bottom());
 
   // The tab indicators should be flush with the top of the widget.
   EXPECT_EQ(0, GetBoundsInWidget(tabstrip).y());