Extract minimal RenderViewHost interface for embedders, leaving

chrome/test/base/browser_with_test_window_test.cc

Index: chrome/test/base/browser_with_test_window_test.cc
diff --git a/chrome/test/base/browser_with_test_window_test.cc b/chrome/test/base/browser_with_test_window_test.cc
index 1b8fc00602bca431b1fc9c4fdfaf55875e1e7166..29e058205682c5da1e55f23841cc5eb592fd2e9c 100644
--- a/chrome/test/base/browser_with_test_window_test.cc
+++ b/chrome/test/base/browser_with_test_window_test.cc
@@ -123,7 +123,7 @@ void BrowserWithTestWindowTest::CommitPendingLoad(
   } else {
     test_rvh->SendNavigateWithTransition(
         controller->GetWebContents()->
-            GetMaxPageIDForSiteInstance(test_rvh->site_instance()) + 1,
+            GetMaxPageIDForSiteInstance(test_rvh->GetSiteInstance()) + 1,
         controller->GetPendingEntry()->GetURL(),
         controller->GetPendingEntry()->GetTransitionType());
   }