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

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

Index: chrome/browser/ui/views/frame/browser_non_client_frame_view_ash.cc
diff --git a/chrome/browser/ui/views/frame/browser_non_client_frame_view_ash.cc b/chrome/browser/ui/views/frame/browser_non_client_frame_view_ash.cc
index 4f1024844a816b1c2c6af879403b6cfc281c11bf..d2d76650ff68bfe48e304dad1d22618c954e830f 100644
--- a/chrome/browser/ui/views/frame/browser_non_client_frame_view_ash.cc
+++ b/chrome/browser/ui/views/frame/browser_non_client_frame_view_ash.cc
@@ -137,11 +137,6 @@ gfx::Rect BrowserNonClientFrameViewAsh::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.
   const int left_inset = GetTabStripLeftInset();
   return gfx::Rect(left_inset, GetTopInset(false),
                    std::max(0, width() - left_inset - GetTabStripRightInset()),
@@ -149,7 +144,7 @@ gfx::Rect BrowserNonClientFrameViewAsh::GetBoundsForTabStrip(
 }
 
 int BrowserNonClientFrameViewAsh::GetTopInset(bool restored) const {
-  if (!ShouldPaint() || UseImmersiveLightbarHeaderStyle())
+  if (!ShouldPaint() || IsImmersiveFullscreenUnrevealed())
     return 0;
 
   if (!browser_view()->IsTabStripVisible()) {
@@ -216,12 +211,7 @@ void BrowserNonClientFrameViewAsh::GetWindowMask(const gfx::Size& size,
 }
 
 void BrowserNonClientFrameViewAsh::ResetWindowControls() {
-  // Hide the caption buttons in immersive fullscreen when the tab light bar
-  // is visible because it's confusing when the user hovers or clicks in the
-  // top-right of the screen and hits one.
-  // TODO(yiyix): Update |caption_button_container_|'s visibility calculation
-  // when Chrome OS MD is enabled by default.
-  caption_button_container_->SetVisible(!UseImmersiveLightbarHeaderStyle());
+  caption_button_container_->SetVisible(!IsImmersiveFullscreenUnrevealed());
   caption_button_container_->ResetWindowControls();
 }
 
@@ -245,14 +235,6 @@ void BrowserNonClientFrameViewAsh::OnPaint(gfx::Canvas* canvas) {
   if (!ShouldPaint())
     return;
 
-  if (UseImmersiveLightbarHeaderStyle()) {
-    // The light bar header is not themed because theming it does not look good.
-    canvas->FillRect(
-        gfx::Rect(width(), header_painter_->GetHeaderHeightForPainting()),
-        SK_ColorBLACK);
-    return;
-  }
-
   const bool should_paint_as_active = ShouldPaintAsActive();
   caption_button_container_->SetPaintAsActive(should_paint_as_active);
 
@@ -274,15 +256,8 @@ void BrowserNonClientFrameViewAsh::Layout() {
   header_painter_->LayoutHeader();
 
   int painted_height = GetTopInset(false);
-  if (browser_view()->IsTabStripVisible()) {
-    const ImmersiveModeController* const immersive_controller =
-        browser_view()->immersive_mode_controller();
-    if (!immersive_controller->IsEnabled() ||
-        immersive_controller->IsRevealed() ||
-        !ash::MaterialDesignController::IsImmersiveModeMaterial()) {
-      painted_height += browser_view()->tabstrip()->GetPreferredSize().height();
-    }
-  }
+  if (browser_view()->IsTabStripVisible())
+    painted_height += browser_view()->tabstrip()->GetPreferredSize().height();
 
   header_painter_->SetHeaderHeightForPainting(painted_height);
 
@@ -402,15 +377,11 @@ int BrowserNonClientFrameViewAsh::GetTabStripRightInset() const {
       caption_button_container_->GetPreferredSize().width();
 }
 
-bool BrowserNonClientFrameViewAsh::UseImmersiveLightbarHeaderStyle() const {
-  if (ash::MaterialDesignController::IsImmersiveModeMaterial())
-    return false;
-
+bool BrowserNonClientFrameViewAsh::IsImmersiveFullscreenUnrevealed() const {
   const ImmersiveModeController* const immersive_controller =
       browser_view()->immersive_mode_controller();
   return immersive_controller->IsEnabled() &&
-         !immersive_controller->IsRevealed() &&
-         browser_view()->IsTabStripVisible();
+         !immersive_controller->IsRevealed();
 }
 
 bool BrowserNonClientFrameViewAsh::UsePackagedAppHeaderStyle() const {
@@ -433,10 +404,9 @@ void BrowserNonClientFrameViewAsh::LayoutProfileIndicatorIcon() {
                             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.
-  const bool avatar_visible = !UseImmersiveLightbarHeaderStyle();
+  // Hide the incognito icon in immersive fullscreen unrevealed state because
+  // the header height is zero for displaying the icon.
+  const bool avatar_visible = !IsImmersiveFullscreenUnrevealed();
   const int avatar_height = avatar_visible ? (avatar_bottom - avatar_y) : 0;
   profile_indicator_icon()->SetBounds(kAvatarIconPadding, avatar_y,
                                       incognito_icon.width(), avatar_height);
@@ -447,14 +417,12 @@ bool BrowserNonClientFrameViewAsh::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 BrowserNonClientFrameViewAsh::PaintToolbarBackground(gfx::Canvas* canvas) {