Remove old (dead) app list code.

ui/app_list/views/folder_header_view.cc

Index: ui/app_list/views/folder_header_view.cc
diff --git a/ui/app_list/views/folder_header_view.cc b/ui/app_list/views/folder_header_view.cc
index 0cf485a2b0cb47955d454fb903e70c7edc29e0b4..7fd811b6558baf3124495c0887e02001a91bbbac 100644
--- a/ui/app_list/views/folder_header_view.cc
+++ b/ui/app_list/views/folder_header_view.cc
@@ -28,9 +28,6 @@ namespace {
 
 const int kPreferredWidth = 360;
 const int kPreferredHeight = 48;
-const int kIconDimension = 24;
-const int kBackButtonPadding = 14;
-const int kBottomSeparatorPadding = 9;  // Non-experimental app list only.
 const int kBottomSeparatorHeight = 1;
 const int kMaxFolderNameWidth = 300;
 
@@ -51,7 +48,6 @@ class FolderHeaderView::FolderNameView : public views::Textfield {
 
 FolderHeaderView::FolderHeaderView(FolderHeaderViewDelegate* delegate)
     : folder_item_(nullptr),
-      back_button_(nullptr),
       folder_name_view_(new FolderNameView),
       folder_name_placeholder_text_(
           ui::ResourceBundle::GetSharedInstance().GetLocalizedString(
@@ -59,21 +55,6 @@ FolderHeaderView::FolderHeaderView(FolderHeaderViewDelegate* delegate)
       delegate_(delegate),
       folder_name_visible_(true) {
   ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
-  if (!app_list::switches::IsExperimentalAppListEnabled()) {
-    back_button_ = new views::ImageButton(this);
-    back_button_->SetImage(
-        views::ImageButton::STATE_NORMAL,
-        rb.GetImageSkiaNamed(IDR_APP_LIST_FOLDER_BACK_NORMAL));
-    back_button_->SetImageAlignment(views::ImageButton::ALIGN_CENTER,
-                                    views::ImageButton::ALIGN_MIDDLE);
-    AddChildView(back_button_);
-    back_button_->SetFocusForPlatform();
-    back_button_->set_request_focus_on_press(true);
-    back_button_->SetAccessibleName(
-        ui::ResourceBundle::GetSharedInstance().GetLocalizedString(
-            IDS_APP_LIST_FOLDER_CLOSE_FOLDER_ACCESSIBILE_NAME));
-  }
-
   folder_name_view_->SetFontList(
       rb.GetFontList(ui::ResourceBundle::MediumFont));
   folder_name_view_->set_placeholder_text_color(kFolderTitleHintTextColor);
@@ -171,14 +152,6 @@ void FolderHeaderView::Layout() {
   if (rect.IsEmpty())
     return;
 
-  if (!switches::IsExperimentalAppListEnabled()) {
-    gfx::Rect back_bounds;
-    DCHECK(back_button_);
-    back_bounds = rect;
-    back_bounds.set_width(kIconDimension + 2 * kBackButtonPadding);
-    back_button_->SetBoundsRect(back_bounds);
-  }
-
   gfx::Rect text_bounds(rect);
   base::string16 text = folder_item_ && !folder_item_->name().empty()
                             ? base::UTF8ToUTF16(folder_item_->name())
@@ -210,10 +183,7 @@ void FolderHeaderView::OnPaint(gfx::Canvas* canvas) {
     return;
 
   // Draw bottom separator line.
-  int horizontal_padding = app_list::switches::IsExperimentalAppListEnabled()
-                               ? kExperimentalAppsGridPadding
-                               : kBottomSeparatorPadding;
-  rect.Inset(horizontal_padding, 0);
+  rect.Inset(kAppsGridPadding, 0);
   rect.set_y(rect.bottom() - kBottomSeparatorHeight);
   rect.set_height(kBottomSeparatorHeight);
   canvas->FillRect(rect, kTopSeparatorColor);