Revert of Revert of [site isolation] cross-site transfers should track the RenderFrameHost

content/test/test_render_view_host.cc

Index: content/test/test_render_view_host.cc
diff --git a/content/test/test_render_view_host.cc b/content/test/test_render_view_host.cc
index 6a1177d939d579ade07b4bb01a8107390e598d17..158d06f5a40ce77da33d4ebc68087df85e6a0446 100644
--- a/content/test/test_render_view_host.cc
+++ b/content/test/test_render_view_host.cc
@@ -389,6 +389,10 @@
   return static_cast<TestRenderFrameHost*>(main_rfh());
 }
 
+TestRenderFrameHost* RenderViewHostImplTestHarness::pending_main_test_rfh() {
+  return static_cast<TestRenderFrameHost*>(pending_main_rfh());
+}
+
 TestWebContents* RenderViewHostImplTestHarness::contents() {
   return static_cast<TestWebContents*>(web_contents());
 }