Rename ash desktop_background to wallpaper.

ash/wm/session_state_animator_impl_unittest.cc

Index: ash/wm/session_state_animator_impl_unittest.cc
diff --git a/ash/wm/session_state_animator_impl_unittest.cc b/ash/wm/session_state_animator_impl_unittest.cc
index a4b801045631c08a19686762a7aea8866d676da0..8a9b1c46506f570f476da3591b0febd9b7ee2204 100644
--- a/ash/wm/session_state_animator_impl_unittest.cc
+++ b/ash/wm/session_state_animator_impl_unittest.cc
@@ -39,10 +39,10 @@ TEST_F(SessionStateAnimatiorImplContainersTest, ContainersHaveIdTest) {
 
   containers.clear();
 
-  SessionStateAnimatorImpl::GetContainers(
-      SessionStateAnimator::DESKTOP_BACKGROUND, &containers);
-  EXPECT_TRUE(ContainersHaveWindowWithId(
-      containers, kShellWindowId_DesktopBackgroundContainer));
+  SessionStateAnimatorImpl::GetContainers(SessionStateAnimator::WALLPAPER,
+                                          &containers);
+  EXPECT_TRUE(ContainersHaveWindowWithId(containers,
+                                         kShellWindowId_WallpaperContainer));
 
   containers.clear();
 
@@ -63,9 +63,9 @@ TEST_F(SessionStateAnimatiorImplContainersTest, ContainersHaveIdTest) {
 
   // Check for lock screen containers.
   SessionStateAnimatorImpl::GetContainers(
-      SessionStateAnimator::LOCK_SCREEN_BACKGROUND, &containers);
+      SessionStateAnimator::LOCK_SCREEN_WALLPAPER, &containers);
   EXPECT_TRUE(ContainersHaveWindowWithId(
-      containers, kShellWindowId_LockScreenBackgroundContainer));
+      containers, kShellWindowId_LockScreenWallpaperContainer));
 
   containers.clear();