Remove "top_down" flag in the message center code

ui/message_center/views/message_center_view.cc

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/message_center/views/message_center_view.h"
 
 #include <list>
 #include <map>
 
 #include "base/macros.h"
@@ skipping 44 matching lines @@
   view->SetEnabled(enabled);
 }
 
 }  // namespace
 
 // MessageCenterView ///////////////////////////////////////////////////////////
 
 MessageCenterView::MessageCenterView(MessageCenter* message_center,
                                      MessageCenterTray* tray,
                                      int max_height,
-                                     bool initially_settings_visible,
-                                     bool top_down)
+                                     bool initially_settings_visible)
     : message_center_(message_center),
       tray_(tray),
       scroller_(NULL),
       settings_view_(NULL),
       button_bar_(NULL),
-      top_down_(top_down),
       settings_visible_(initially_settings_visible),
       source_view_(NULL),
       source_height_(0),
       target_view_(NULL),
       target_height_(0),
       is_closing_(false),
       is_locked_(message_center_->IsLockedState()),
       mode_((!initially_settings_visible || is_locked_) ? Mode::BUTTONS_ONLY
                                                         : Mode::SETTINGS),
       context_menu_controller_(new MessageViewContextMenuController(this)) {
@@ skipping 14 matching lines @@
   scroller_ = new views::ScrollView();
   scroller_->ClipHeightTo(kMinScrollViewHeight, max_height - button_height);
   scroller_->SetVerticalScrollBar(new views::OverlayScrollBar(false));
   scroller_->set_background(
       views::Background::CreateSolidBackground(kMessageCenterBackgroundColor));
 
   scroller_->SetPaintToLayer(true);
   scroller_->layer()->SetFillsBoundsOpaquely(false);
   scroller_->layer()->SetMasksToBounds(true);
 
-  message_list_view_.reset(new MessageListView(top_down));
+  message_list_view_.reset(new MessageListView());
   message_list_view_->set_owned_by_client();
   message_list_view_->AddObserver(this);
 
   // We want to swap the contents of the scroll view between the empty list
   // view and the message list view, without constructing them afresh each
   // time.  So, since the scroll view deletes old contents each time you
   // set the contents (regardless of the |owned_by_client_| setting) we need
   // an intermediate view for the contents whose children we can swap in and
   // out.
   views::View* scroller_contents = new views::View();
@@ skipping 90 matching lines @@
 void MessageCenterView::Layout() {
   if (is_closing_)
     return;
 
   int button_height = button_bar_->GetHeightForWidth(width()) +
                       button_bar_->GetInsets().height();
   // Skip unnecessary re-layout of contents during the resize animation.
   bool animating = settings_transition_animation_ &&
                    settings_transition_animation_->is_animating();
   if (animating && settings_transition_animation_->current_part_index() == 0) {
-    if (!top_down_) {
-      button_bar_->SetBounds(
-          0, height() - button_height, width(), button_height);
-    }
+    button_bar_->SetBounds(0, height() - button_height, width(), button_height);
     return;
   }
 
   scroller_->SetBounds(0,
-                       top_down_ ? button_height : 0,
+                       0,
                        width(),
                        height() - button_height);
   settings_view_->SetBounds(0,
-                            top_down_ ? button_height : 0,
+                            0,
                             width(),
                             height() - button_height);
 
   bool is_scrollable = false;
   if (scroller_->visible())
     is_scrollable = scroller_->height() < message_list_view_->height();
   else if (settings_view_->visible())
     is_scrollable = settings_view_->IsScrollable();
 
   if (!animating) {
     if (is_scrollable) {
       // Draw separator line on the top of the button bar if it is on the bottom
       // or draw it at the bottom if the bar is on the top.
       button_bar_->SetBorder(views::CreateSolidSidedBorder(
-          top_down_ ? 0 : 1, 0, top_down_ ? 1 : 0, 0, kFooterDelimiterColor));
+          1, 0, 0, 0, kFooterDelimiterColor));
     } else {
       button_bar_->SetBorder(
-          views::CreateEmptyBorder(top_down_ ? 0 : 1, 0, top_down_ ? 1 : 0, 0));
+          views::CreateEmptyBorder(1, 0, 0, 0));
     }
     button_bar_->SchedulePaint();
   }
   button_bar_->SetBounds(0,
-                         top_down_ ? 0 : height() - button_height,
+                         height() - button_height,
                          width(),
                          button_height);
   if (GetWidget())
     GetWidget()->GetRootView()->SchedulePaint();
 }
 
 gfx::Size MessageCenterView::GetPreferredSize() const {
   if (settings_transition_animation_ &&
       settings_transition_animation_->is_animating()) {
     int content_width =
@@ skipping 378 matching lines @@
     // Disable the close-all button since no notification is visible.
     button_bar_->SetCloseAllButtonEnabled(false);
   }
 }
 
 void MessageCenterView::SetNotificationViewForTest(MessageView* view) {
   message_list_view_->AddNotificationAt(view, 0);
 }
 
 }  // namespace message_center