Rename ash desktop_background to wallpaper.

ash/utility/screenshot_controller.cc

 // Copyright 2014 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/utility/screenshot_controller.h"
 
 #include <cmath>
 
 #include "ash/common/shell_window_ids.h"
 #include "ash/display/mouse_cursor_event_filter.h"
@@ skipping 369 matching lines @@
 
 void ScreenshotController::UpdateSelectedWindow(ui::LocatedEvent* event) {
   aura::Window* selected = ScreenshotWindowTargeter().FindWindowForEvent(event);
 
   // Find a window that is backed with a widget.
   while (selected && (selected->type() == ui::wm::WINDOW_TYPE_CONTROL ||
                       !selected->delegate())) {
     selected = selected->parent();
   }
 
-  if (selected->parent()->id() == kShellWindowId_DesktopBackgroundContainer ||
-      selected->parent()->id() == kShellWindowId_LockScreenBackgroundContainer)
+  if (selected->parent()->id() == kShellWindowId_WallpaperContainer ||
+      selected->parent()->id() == kShellWindowId_LockScreenWallpaperContainer)
     selected = nullptr;
 
   SetSelectedWindow(selected);
 }
 
 void ScreenshotController::SetSelectedWindow(aura::Window* selected) {
   if (selected_ == selected)
     return;
 
   if (selected_) {
@@ skipping 132 matching lines @@
 
 void ScreenshotController::OnDisplayMetricsChanged(
     const display::Display& display,
     uint32_t changed_metrics) {}
 
 void ScreenshotController::OnWindowDestroying(aura::Window* window) {
   SetSelectedWindow(nullptr);
 }
 
 }  // namespace ash