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

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

Index: chrome/browser/ui/views/frame/browser_non_client_frame_view_mus.cc
diff --git a/chrome/browser/ui/views/frame/browser_non_client_frame_view_mus.cc b/chrome/browser/ui/views/frame/browser_non_client_frame_view_mus.cc
index 3fa2a16a7e8d32770cc9046255e4b04bdd1c3cf6..5d94e6a96578789708863524a6dd7ba081c66a58 100644
--- a/chrome/browser/ui/views/frame/browser_non_client_frame_view_mus.cc
+++ b/chrome/browser/ui/views/frame/browser_non_client_frame_view_mus.cc
@@ -135,11 +135,6 @@ gfx::Rect BrowserNonClientFrameViewMus::GetBoundsForTabStrip(
   if (!tabstrip)
     return gfx::Rect();
 
-  // When the tab strip is painted in the immersive fullscreen light bar style,
-  // the caption buttons and the avatar button are not visible. However, their
-  // bounds are still used to compute the tab strip bounds so that the tabs have
-  // the same horizontal position when the tab strip is painted in the immersive
-  // light bar style as when the top-of-window views are revealed.
   int left_inset = GetTabStripLeftInset();
   int right_inset = GetTabStripRightInset();
   return gfx::Rect(left_inset, GetTopInset(false),
@@ -148,7 +143,7 @@ gfx::Rect BrowserNonClientFrameViewMus::GetBoundsForTabStrip(
 }
 
 int BrowserNonClientFrameViewMus::GetTopInset(bool restored) const {
-  if (!ShouldPaint() || UseImmersiveLightbarHeaderStyle())
+  if (!ShouldPaint() || IsImmersiveFullscreenUnrevealed())
     return 0;
 
   if (browser_view()->IsTabStripVisible()) {
@@ -296,13 +291,6 @@ void BrowserNonClientFrameViewMus::OnPaint(gfx::Canvas* canvas) {
   if (!ShouldPaint())
     return;
 
-  // TODO(sky): get immersive mode working.
-
-  if (UseImmersiveLightbarHeaderStyle()) {
-    PaintImmersiveLightbarStyleHeader(canvas);
-    return;
-  }
-
   if (browser_view()->IsToolbarVisible())
     PaintToolbarBackground(canvas);
   else if (!UsePackagedAppHeaderStyle())
@@ -416,12 +404,11 @@ int BrowserNonClientFrameViewMus::GetTabStripRightInset() const {
   return right_inset;
 }
 
-bool BrowserNonClientFrameViewMus::UseImmersiveLightbarHeaderStyle() const {
+bool BrowserNonClientFrameViewMus::IsImmersiveFullscreenUnrevealed() const {
   ImmersiveModeController* immersive_controller =
       browser_view()->immersive_mode_controller();
   return immersive_controller->IsEnabled() &&
-         !immersive_controller->IsRevealed() &&
-         browser_view()->IsTabStripVisible();
+         !immersive_controller->IsRevealed();
 }
 
 bool BrowserNonClientFrameViewMus::UsePackagedAppHeaderStyle() const {
@@ -442,10 +429,9 @@ void BrowserNonClientFrameViewMus::LayoutIncognitoButton() {
                       kAvatarIconPadding;
   int avatar_y = avatar_bottom - incognito_icon.height();
 
-  // Hide the incognito icon in immersive fullscreen when the tab light bar is
-  // visible because the header is too short for the icognito icon to be
-  // recognizable.
-  bool avatar_visible = !UseImmersiveLightbarHeaderStyle();
+  // Hide the incognito icon in immersive fullscreen unrevealed state because
+  // the header height is zero for displaying the icon.
+  bool avatar_visible = !IsImmersiveFullscreenUnrevealed();
   int avatar_height = avatar_visible ? incognito_icon.height() : 0;
 
   gfx::Rect avatar_bounds(kAvatarIconPadding, avatar_y, incognito_icon.width(),
@@ -467,19 +453,14 @@ bool BrowserNonClientFrameViewMus::ShouldPaint() const {
   if (!frame()->IsFullscreen())
     return true;
 
-  // We need to paint when in immersive fullscreen and either:
-  // - The top-of-window views are revealed.
-  // - The lightbar style tabstrip is visible.
+  // We need to paint when the top-of-window views are revealed in immersive
+  // fullscreen.
   ImmersiveModeController* immersive_mode_controller =
       browser_view()->immersive_mode_controller();
   return immersive_mode_controller->IsEnabled() &&
-         (immersive_mode_controller->IsRevealed() ||
-          UseImmersiveLightbarHeaderStyle());
+         immersive_mode_controller->IsRevealed();
 }
 
-void BrowserNonClientFrameViewMus::PaintImmersiveLightbarStyleHeader(
-    gfx::Canvas* canvas) {}
-
 void BrowserNonClientFrameViewMus::PaintToolbarBackground(gfx::Canvas* canvas) {
   gfx::Rect toolbar_bounds(browser_view()->GetToolbarBounds());
   if (toolbar_bounds.IsEmpty())