Move existing kSitePerProcess checks to a policy-oracle object

components/guest_view/renderer/iframe_guest_view_container.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 "components/guest_view/renderer/iframe_guest_view_container.h"
 
-#include "base/command_line.h"
 #include "components/guest_view/common/guest_view_messages.h"
-#include "content/public/common/content_switches.h"
+#include "content/public/common/browser_plugin_guest_mode.h"
 #include "content/public/renderer/render_frame.h"
 
 namespace guest_view {
 
 IframeGuestViewContainer::IframeGuestViewContainer(
     content::RenderFrame* render_frame)
     : GuestViewContainer(render_frame) {
-  CHECK(base::CommandLine::ForCurrentProcess()->HasSwitch(
-      switches::kSitePerProcess));
+  CHECK(content::BrowserPluginGuestMode::UseCrossProcessFramesForGuests());
   // There is no BrowserPluginDelegate to wait for.
   ready_ = true;
 }
 
 IframeGuestViewContainer::~IframeGuestViewContainer() {
 }
 
 bool IframeGuestViewContainer::OnMessage(const IPC::Message& message) {
   // TODO(lazyboy): Do not send this message in --site-per-process.
   if (message.type() == GuestViewMsg_GuestAttached::ID)
     return true;
 
   if (message.type() != GuestViewMsg_AttachToEmbedderFrame_ACK::ID)
     return false;
 
   OnHandleCallback(message);
   return true;
 }
 
 }  // namespace guest_view