Move existing kSitePerProcess checks to a policy-oracle object

content/browser/web_contents/web_contents_impl_unittest.cc

Index: content/browser/web_contents/web_contents_impl_unittest.cc
diff --git a/content/browser/web_contents/web_contents_impl_unittest.cc b/content/browser/web_contents/web_contents_impl_unittest.cc
index d056e6ddfd6902bfd982d40b288436386f038e91..325425f533139368e4ab1bc18ff5eb71540d1ced 100644
--- a/content/browser/web_contents/web_contents_impl_unittest.cc
+++ b/content/browser/web_contents/web_contents_impl_unittest.cc
@@ -29,6 +29,7 @@
 #include "content/public/common/bindings_policy.h"
 #include "content/public/common/content_constants.h"
 #include "content/public/common/content_switches.h"
+#include "content/public/common/site_isolation_policy.h"
 #include "content/public/common/url_constants.h"
 #include "content/public/common/url_utils.h"
 #include "content/public/test/mock_render_process_host.h"
@@ -2864,8 +2865,8 @@ TEST_F(WebContentsImplTest, StartStopEventsBalance) {
   // The bug manifests itself in regular mode as well, but browser-initiated
   // navigation of subframes is only possible in --site-per-process mode within
   // unit tests.
-  base::CommandLine::ForCurrentProcess()->AppendSwitch(
-      switches::kSitePerProcess);
+  SiteIsolationPolicy::IsolateAllSitesForTesting(
+      base::CommandLine::ForCurrentProcess());
   const GURL initial_url("about:blank");
   const GURL main_url("http://www.chromium.org");
   const GURL foo_url("http://foo.chromium.org");