Move existing kSitePerProcess checks to a policy-oracle object

content/browser/site_per_process_browsertest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/site_per_process_browsertest.h"
 
 #include <algorithm>
 #include <vector>
 
 #include "base/command_line.h"
@@ skipping 273 matching lines @@
 
 void SitePerProcessBrowserTest::StartFrameAtDataURL() {
   std::string data_url_script =
       "var iframes = document.getElementById('test');iframes.src="
       "'data:text/html,dataurl';";
   ASSERT_TRUE(ExecuteScript(shell()->web_contents(), data_url_script));
 }
 
 void SitePerProcessBrowserTest::SetUpCommandLine(
     base::CommandLine* command_line) {
-  command_line->AppendSwitch(switches::kSitePerProcess);
+  IsolateAllSitesForTesting(command_line);
 };
 
 void SitePerProcessBrowserTest::SetUpOnMainThread() {
   host_resolver()->AddRule("*", "127.0.0.1");
   ASSERT_TRUE(embedded_test_server()->InitializeAndWaitUntilReady());
   SetupCrossSiteRedirector(embedded_test_server());
 }
 
 // Ensure that navigating subframes in --site-per-process mode works and the
 // correct documents are committed.
@@ skipping 2588 matching lines @@
       foo_root->render_manager()->GetRenderFrameProxyHost(site_instance_a));
 
   // Verify that the a.com popup can now find the "foo" popup by name.
   GURL named_frame_url(embedded_test_server()->GetURL("c.com", "/title2.html"));
   NavigateNamedFrame(a_com_shell->web_contents(), named_frame_url, "foo");
   EXPECT_TRUE(WaitForLoadStop(foo_shell->web_contents()));
   EXPECT_EQ(named_frame_url, foo_root->current_url());
 }
 
 }  // namespace content