Remove "if (WallpaperManager::Get())" from MultiUserWindowManagerChromeOS::TransitionWallpaper()

chromeos::WallpaperManager::Get() either returns true or it returns not at all,
thus the if(...) can be safely removed.

BUG=none

Review URL: https://codereview.chromium.org/189913011

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@255989 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/ui/ash/multi_user/multi_user_window_manager_chromeos.cc

@@ -662,7 +662,6 @@ void MultiUserWindowManagerChromeOS::TransitionUser(
 void MultiUserWindowManagerChromeOS::TransitionWallpaper(
     MultiUserWindowManagerChromeOS::AnimationStep animation_step) {
   // Handle the wallpaper switch.
-  if (chromeos::WallpaperManager::Get()) {
   ash::UserWallpaperDelegate* wallpaper_delegate =
       ash::Shell::GetInstance()->user_wallpaper_delegate();
   if (animation_step == HIDE_OLD_USER) {
@@ -676,7 +675,6 @@ void MultiUserWindowManagerChromeOS::TransitionWallpaper(
     // default.
     wallpaper_delegate->SetAnimationDurationOverride(0);
   }
-  }
 }
 
 void MultiUserWindowManagerChromeOS::TransitionUserShelf(