Move existing kSitePerProcess checks to a policy-oracle object

content/browser/frame_host/render_widget_host_view_child_frame_browsertest.cc

 // Copyright 2015 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 "base/command_line.h"
 #include "content/browser/web_contents/web_contents_impl.h"
 #include "content/public/browser/render_frame_host.h"
 #include "content/public/browser/web_contents.h"
-#include "content/public/common/content_switches.h"
 #include "content/public/test/browser_test_utils.h"
 #include "content/public/test/content_browser_test.h"
 #include "content/public/test/content_browser_test_utils.h"
 #include "content/public/test/test_utils.h"
 #include "content/shell/browser/shell.h"
 #include "content/test/content_browser_test_utils_internal.h"
 #include "content/test/test_content_browser_client.h"
 #include "net/dns/mock_host_resolver.h"
 #include "net/test/embedded_test_server/embedded_test_server.h"
 
 namespace content {
 
 class RenderWidgetHostViewChildFrameTest : public ContentBrowserTest {
  public:
   RenderWidgetHostViewChildFrameTest() {}
 
   void SetUpCommandLine(base::CommandLine* command_line) override {
-    command_line->AppendSwitch(switches::kSitePerProcess);
+    IsolateAllSitesForTesting(command_line);
   }
 
   void SetUpOnMainThread() override {
     host_resolver()->AddRule("*", "127.0.0.1");
     ASSERT_TRUE(embedded_test_server()->InitializeAndWaitUntilReady());
     SetupCrossSiteRedirector(embedded_test_server());
   }
 
   void CheckScreenWidth(RenderFrameHost* render_frame_host) {
     int width;
@@ skipping 29 matching lines @@
   ExecuteScriptAndGetValue(shell()->web_contents()->GetMainFrame(),
       "window.screen.width")->GetAsInteger(&main_frame_screen_width);
   set_expected_screen_width(main_frame_screen_width);
   EXPECT_FALSE(main_frame_screen_width == 0);
 
   shell()->web_contents()->ForEachFrame(
       base::Bind(&RenderWidgetHostViewChildFrameTest::CheckScreenWidth, this));
 }
 
 }  // namespace content