Move existing kSitePerProcess checks to a policy-oracle object

content/browser/frame_host/render_frame_host_manager_browsertest.cc

Index: content/browser/frame_host/render_frame_host_manager_browsertest.cc
diff --git a/content/browser/frame_host/render_frame_host_manager_browsertest.cc b/content/browser/frame_host/render_frame_host_manager_browsertest.cc
index 19e81a0875803714a81796585bd5a769904a8f17..7ad6055b62957cfc24f014c384b31748c8cb0b12 100644
--- a/content/browser/frame_host/render_frame_host_manager_browsertest.cc
+++ b/content/browser/frame_host/render_frame_host_manager_browsertest.cc
@@ -328,11 +328,10 @@ IN_PROC_BROWSER_TEST_F(RenderFrameHostManagerTest,
   // Should have the same SiteInstance unless we're in site-per-process mode.
   scoped_refptr<SiteInstance> blank_site_instance(
       new_shell->web_contents()->GetSiteInstance());
-  if (!base::CommandLine::ForCurrentProcess()->HasSwitch(
-          switches::kSitePerProcess))
-    EXPECT_EQ(orig_site_instance, blank_site_instance);
-  else
+  if (AreAllSitesIsolatedForTesting())
     EXPECT_NE(orig_site_instance, blank_site_instance);
+  else
+    EXPECT_EQ(orig_site_instance, blank_site_instance);
 }
 
 // Test for crbug.com/24447.  Following a cross-site link with rel=noreferrer
@@ -373,11 +372,10 @@ IN_PROC_BROWSER_TEST_F(RenderFrameHostManagerTest,
   // Should have the same SiteInstance unless we're in site-per-process mode.
   scoped_refptr<SiteInstance> noref_site_instance(
       shell()->web_contents()->GetSiteInstance());
-  if (!base::CommandLine::ForCurrentProcess()->HasSwitch(
-          switches::kSitePerProcess))
-    EXPECT_EQ(orig_site_instance, noref_site_instance);
-  else
+  if (AreAllSitesIsolatedForTesting())
     EXPECT_NE(orig_site_instance, noref_site_instance);
+  else
+    EXPECT_EQ(orig_site_instance, noref_site_instance);
 }
 
 // Test for crbug.com/116192.  Targeted links should still work after the