Move existing kSitePerProcess checks to a policy-oracle object

chrome/browser/chrome_content_browser_client_browsertest.cc

Index: chrome/browser/chrome_content_browser_client_browsertest.cc
diff --git a/chrome/browser/chrome_content_browser_client_browsertest.cc b/chrome/browser/chrome_content_browser_client_browsertest.cc
index 46bcbd6d12b01f83c2fac5389ee7e58c643fcfd8..5268dccfa2c06ad105a5d40cea65aae8fa00a0e3 100644
--- a/chrome/browser/chrome_content_browser_client_browsertest.cc
+++ b/chrome/browser/chrome_content_browser_client_browsertest.cc
@@ -11,7 +11,7 @@
 #include "content/public/browser/navigation_controller.h"
 #include "content/public/browser/navigation_entry.h"
 #include "content/public/browser/web_contents.h"
-#include "content/public/common/content_switches.h"
+#include "content/public/test/browser_test_utils.h"
 #include "url/gurl.h"
 
 namespace content {
@@ -87,8 +87,7 @@ IN_PROC_BROWSER_TEST_F(ChromeContentBrowserClientBrowserTest,
 // such as http://crbug.com/164223.
 IN_PROC_BROWSER_TEST_F(ChromeContentBrowserClientBrowserTest,
                        SitePerProcessNavigation) {
-  base::CommandLine::ForCurrentProcess()->AppendSwitch(
-      switches::kSitePerProcess);
+  content::IsolateAllSitesForTesting(base::CommandLine::ForCurrentProcess());
   ASSERT_TRUE(test_server()->Start());
   const GURL url(test_server()->GetURL("files/title1.html"));