[content shell] hook up navigation related WebTestDelegate methods

content/public/browser/navigation_controller.h

Index: content/public/browser/navigation_controller.h
diff --git a/content/public/browser/navigation_controller.h b/content/public/browser/navigation_controller.h
index 3ef730cd40680eaefbb3d8a88c1a72c8d02128fc..914c896ad224c9a9cf883be4b0dcf7d8422447f3 100644
--- a/content/public/browser/navigation_controller.h
+++ b/content/public/browser/navigation_controller.h
@@ -155,6 +155,10 @@ class NavigationController {
     // in which case it should replace the current navigation entry.
     bool is_cross_site_redirect;
 
+    // Used to specify which frame to navigate. If empty, the main frame is
+    // navigated. This is currently only used in tests.
+    std::string frame_name;
+
     explicit LoadURLParams(const GURL& url);
     ~LoadURLParams();