Move existing kSitePerProcess checks to a policy-oracle object

chrome/browser/password_manager/password_manager_browsertest.cc

Index: chrome/browser/password_manager/password_manager_browsertest.cc
diff --git a/chrome/browser/password_manager/password_manager_browsertest.cc b/chrome/browser/password_manager/password_manager_browsertest.cc
index 0d0f9c39161cd7fc7ef841240ae7e48be1a7fbcb..915796b2e1747d6e5192d9b86879b86784877b07 100644
--- a/chrome/browser/password_manager/password_manager_browsertest.cc
+++ b/chrome/browser/password_manager/password_manager_browsertest.cc
@@ -1970,8 +1970,7 @@ IN_PROC_BROWSER_TEST_F(PasswordManagerBrowserTestBase,
 IN_PROC_BROWSER_TEST_F(PasswordManagerBrowserTestBase,
                        CrossSitePasswordEnforcement) {
   // The code under test is only active under site isolation.
-  if (!base::CommandLine::ForCurrentProcess()->HasSwitch(
-          ::switches::kSitePerProcess)) {
+  if (!content::AreAllSitesIsolatedForTesting()) {
     return;
   }