Make the lifetime of wallpaper manager more clear.

chrome/browser/ui/ash/launcher/chrome_launcher_controller_unittest.cc

Index: chrome/browser/ui/ash/launcher/chrome_launcher_controller_unittest.cc
diff --git a/chrome/browser/ui/ash/launcher/chrome_launcher_controller_unittest.cc b/chrome/browser/ui/ash/launcher/chrome_launcher_controller_unittest.cc
index a65a64ea10ce45ae76c57616a4aefaf4a673eea8..871f373e78597ee17b624db33700e0c253d9a538 100644
--- a/chrome/browser/ui/ash/launcher/chrome_launcher_controller_unittest.cc
+++ b/chrome/browser/ui/ash/launcher/chrome_launcher_controller_unittest.cc
@@ -52,6 +52,7 @@
 #include "chrome/browser/apps/scoped_keep_alive.h"
 #include "chrome/browser/chromeos/login/users/fake_chrome_user_manager.h"
 #include "chrome/browser/chromeos/login/users/scoped_user_manager_enabler.h"
+#include "chrome/browser/chromeos/login/users/wallpaper/wallpaper_manager.h"
 #include "chrome/browser/ui/apps/chrome_app_delegate.h"
 #include "chrome/browser/ui/ash/launcher/app_window_launcher_controller.h"
 #include "chrome/browser/ui/ash/launcher/browser_status_monitor.h"
@@ -783,6 +784,9 @@ class MultiProfileMultiBrowserShelfLayoutChromeLauncherControllerTest
     user_manager_enabler_.reset(new chromeos::ScopedUserManagerEnabler(
         new chromeos::FakeChromeUserManager));
 
+    // Initialize the WallpaperManager singleton.
+    chromeos::WallpaperManager::Initialize();
+
     // Initialize the rest.
     ChromeLauncherControllerTest::SetUp();
 
@@ -799,6 +803,7 @@ class MultiProfileMultiBrowserShelfLayoutChromeLauncherControllerTest
     for (ProfileToNameMap::iterator it = created_profiles_.begin();
          it != created_profiles_.end(); ++it)
       profile_manager_->DeleteTestingProfile(it->second);
+    chromeos::WallpaperManager::Shutdown();
 
     // A Task is leaked if we don't destroy everything, then run the message
     // loop.