Update shelf spacing in Chrome OS according to the MD specs

ash/shelf/shelf_widget.cc

 // Copyright 2012 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/shelf/shelf_widget.h"
 
 #include "ash/ash_switches.h"
 #include "ash/aura/wm_shelf_aura.h"
 #include "ash/aura/wm_window_aura.h"
 #include "ash/common/material_design/material_design_controller.h"
@@ skipping 258 matching lines @@
     shelf_->RemoveObserver(this);
     shelf_ = NULL;
   }
 
   void WillChangeVisibilityState(ShelfVisibilityState new_state) override {
     gfx::Insets mouse_insets;
     gfx::Insets touch_insets;
     if (new_state == SHELF_VISIBLE) {
       // Let clicks at the very top of the shelf through so windows can be
       // resized with the bottom-right corner and bottom edge.
-      mouse_insets = GetInsetsForAlignment(
-          ShelfLayoutManager::kWorkspaceAreaVisibleInset,
-          shelf_->GetAlignment());
+      mouse_insets = GetInsetsForAlignment(kWorkspaceAreaVisibleInset,
+                                           shelf_->GetAlignment());
     } else if (new_state == SHELF_AUTO_HIDE) {
       // Extend the touch hit target out a bit to allow users to drag shelf out
       // while hidden.
-      touch_insets = GetInsetsForAlignment(
-          -ShelfLayoutManager::kWorkspaceAreaAutoHideInset,
-          shelf_->GetAlignment());
+      touch_insets = GetInsetsForAlignment(-kWorkspaceAreaAutoHideInset,
+                                           shelf_->GetAlignment());
     }
 
     set_mouse_extend(mouse_insets);
     set_touch_extend(touch_insets);
   }
 
   ShelfLayoutManager* shelf_;
 
   DISALLOW_COPY_AND_ASSIGN(ShelfWindowTargeter);
 };
@@ skipping 526 matching lines @@
     shelf_layout_manager_->UpdateAutoHideForMouseEvent(event);
 }
 
 void ShelfWidget::OnGestureEvent(ui::GestureEvent* event) {
   Widget::OnGestureEvent(event);
   if (Shell::GetInstance()->in_mus() && shelf_layout_manager_)
     shelf_layout_manager_->UpdateAutoHideForGestureEvent(event);
 }
 
 }  // namespace ash