Replace BrowserProces::AddRefModule/RemoveModule by ScopedKeepAlive

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 9c9fe871b4eb268e9ea5244d8b9abe7beb571721..b64df7dd882b307bd55b4e646d7c0370a63197f4 100644
--- a/chrome/browser/background/background_mode_manager_unittest.cc
+++ b/chrome/browser/background/background_mode_manager_unittest.cc
@@ -207,11 +207,8 @@ class BackgroundModeManagerTest : public testing::Test {
   }
 
   void TearDown() override {
-    // Don't allow the browser to be closed because the shutdown procedure will
-    // attempt to access objects that we haven't created (e.g., MessageCenter).
-    browser_shutdown::SetTryingToQuit(true);
-    chrome::DisableShutdownForTesting(false);
-    browser_shutdown::SetTryingToQuit(false);
+    // Restore the flag's original value (set in TestingBrowserProcess)
+    chrome::DisableShutdownForTesting(true);
   }
 
  protected: