Initialize the message center as part of the testing browser process

chrome/browser/background/background_mode_manager_unittest.cc

Index: chrome/browser/background/background_mode_manager_unittest.cc
diff --git a/chrome/browser/background/background_mode_manager_unittest.cc b/chrome/browser/background/background_mode_manager_unittest.cc
index 6da58ea0297cc791a5bba4c131e1650d02ea114c..7f95687fbfa786ded5edbe24f331e5d36ee23a37 100644
--- a/chrome/browser/background/background_mode_manager_unittest.cc
+++ b/chrome/browser/background/background_mode_manager_unittest.cc
@@ -228,9 +228,6 @@ class BackgroundModeManagerWithExtensionsTest : public testing::Test {
     profile_manager_ = CreateTestingProfileManager();
     profile_ = profile_manager_->CreateTestingProfile("p1");
 
-    // Aura clears notifications from the message center at shutdown.
-    message_center::MessageCenter::Initialize();
-
     test_keep_alive_.reset(
         new ScopedKeepAlive(KeepAliveOrigin::BACKGROUND_MODE_MANAGER,
                             KeepAliveRestartOption::DISABLED));
@@ -276,10 +273,6 @@ class BackgroundModeManagerWithExtensionsTest : public testing::Test {
     // before tearing down the Message Center.
     profile_manager_.reset();
 
-    // Message Center shutdown must occur after the KeepAlive is released
-    // because clearing it will end up referencing the message center.
-    message_center::MessageCenter::Shutdown();
-
     // Clear the shutdown flag to isolate the remaining effect of this test.
     browser_shutdown::SetTryingToQuit(false);
   }