Make RenderFrame(Host) own a RenderWidget(Host).

content/browser/site_per_process_browsertest.cc

Index: content/browser/site_per_process_browsertest.cc
diff --git a/content/browser/site_per_process_browsertest.cc b/content/browser/site_per_process_browsertest.cc
index 0cc1b8f2deb0da9008b7a38fdfce6db5559a8b02..37b78dc1d56fd15ba1161c6d5850c43dd319b846 100644
--- a/content/browser/site_per_process_browsertest.cc
+++ b/content/browser/site_per_process_browsertest.cc
@@ -285,9 +285,12 @@ IN_PROC_BROWSER_TEST_F(SitePerProcessBrowserTest, CrossSiteIframe) {
   proxy_to_parent = child->render_manager()->GetProxyToParent();
   EXPECT_TRUE(proxy_to_parent);
   EXPECT_TRUE(proxy_to_parent->cross_process_frame_connector());
-  EXPECT_EQ(
+  // The out-of-process iframe should have its own RenderWidgetHost,
+  // independent of any RenderViewHost.
+  EXPECT_NE(
       rvh->GetView(),
       proxy_to_parent->cross_process_frame_connector()->get_view_for_testing());
+  EXPECT_TRUE(child->current_frame_host()->GetRenderWidgetHost());
 
   // Load another cross-site page into the same iframe.
   url = embedded_test_server()->GetURL("bar.com", "/title3.html");
@@ -317,9 +320,10 @@ IN_PROC_BROWSER_TEST_F(SitePerProcessBrowserTest, CrossSiteIframe) {
   }
   EXPECT_EQ(proxy_to_parent, child->render_manager()->GetProxyToParent());
   EXPECT_TRUE(proxy_to_parent->cross_process_frame_connector());
-  EXPECT_EQ(
+  EXPECT_NE(
       child->current_frame_host()->render_view_host()->GetView(),
       proxy_to_parent->cross_process_frame_connector()->get_view_for_testing());
+  EXPECT_TRUE(child->current_frame_host()->GetRenderWidgetHost());
 }
 
 // Disabled for flaky crashing: crbug.com/446575