[ash-md] Erases the pre-MD code path for Overview Mode

ash/common/wm/dock/docked_window_layout_manager.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 "ash/common/wm/dock/docked_window_layout_manager.h"
 
 #include "ash/common/material_design/material_design_controller.h"
 #include "ash/common/shelf/shelf_background_animator.h"
 #include "ash/common/shelf/shelf_background_animator_observer.h"
 #include "ash/common/shelf/shelf_constants.h"
@@ skipping 914 matching lines @@
           RestoreDockedWindow(window_state);
       }
     }
   }
   Relayout();
   UpdateDockBounds(DockedWindowLayoutManagerObserver::CHILD_CHANGED);
 }
 
 void DockedWindowLayoutManager::OnOverviewModeStarting() {
   in_overview_ = true;
-  if (!ash::MaterialDesignController::IsOverviewMaterial())
-    return;
   UpdateDockBounds(DockedWindowLayoutManagerObserver::CHILD_CHANGED);
 }
 
 void DockedWindowLayoutManager::OnOverviewModeEnded() {
   in_overview_ = false;
-  if (!ash::MaterialDesignController::IsOverviewMaterial())
-    return;
   UpdateDockBounds(DockedWindowLayoutManagerObserver::CHILD_CHANGED);
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // DockedWindowLayoutManager private implementation:
 
 void DockedWindowLayoutManager::MaybeMinimizeChildrenExcept(WmWindow* child) {
   WindowSelectorController* window_selector_controller =
       WmShell::Get()->window_selector_controller();
   if (window_selector_controller->IsRestoringMinimizedWindows())
@@ skipping 428 matching lines @@
     const gfx::Rect& keyboard_bounds) {
   // This bounds change will have caused a change to the Shelf which does not
   // propagate automatically to this class, so manually recalculate bounds.
   Relayout();
   UpdateDockBounds(DockedWindowLayoutManagerObserver::KEYBOARD_BOUNDS_CHANGING);
 }
 
 void DockedWindowLayoutManager::OnKeyboardClosed() {}
 
 }  // namespace ash