ash: Remove ash::Shelf in favor of ash::WmShelf

ash/common/wm/overview/window_selector.cc

 // Copyright 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/overview/window_selector.h"
 
 #include <algorithm>
 #include <functional>
 #include <set>
 #include <utility>
@@ skipping 150 matching lines @@
  private:
   int corner_radius_;
   SkColor background_;
 
   DISALLOW_COPY_AND_ASSIGN(RoundedContainerView);
 };
 
 // Triggers a shelf visibility update on all root window controllers.
 void UpdateShelfVisibility() {
   for (WmWindow* root : WmShell::Get()->GetAllRootWindows())
-    root->GetRootWindowController()->GetShelf()->UpdateVisibilityState();
+    WmShelf::ForWindow(root)->UpdateVisibilityState();
 }
 
 gfx::Rect GetTextFilterPosition(WmWindow* root_window) {
   if (ash::MaterialDesignController::IsOverviewMaterial()) {
     gfx::Rect total_bounds =
         root_window->ConvertRectToScreen(wm::GetDisplayWorkAreaBoundsInParent(
             root_window->GetChildByShellWindowId(
                 kShellWindowId_DefaultContainer)));
     return gfx::Rect(0.5 * (total_bounds.width() -
                             std::min(kTextFilterWidthMD, total_bounds.width())),
@@ skipping 537 matching lines @@
   for (size_t i = 0; i <= grid_list_.size() &&
                      grid_list_[selected_grid_index_]->Move(direction, animate);
        i++) {
     selected_grid_index_ =
         (selected_grid_index_ + display_direction + grid_list_.size()) %
         grid_list_.size();
   }
 }
 
 }  // namespace ash