Ensure we properly set PageTransition for iframes.

content/browser/security_exploit_browsertest.cc

Index: content/browser/security_exploit_browsertest.cc
diff --git a/content/browser/security_exploit_browsertest.cc b/content/browser/security_exploit_browsertest.cc
index 62d3b62c674820a133f13cd26ed52bbca5d346cc..0044aa437592bb3e7156a757dc530f696cc42d87 100644
--- a/content/browser/security_exploit_browsertest.cc
+++ b/content/browser/security_exploit_browsertest.cc
@@ -70,7 +70,7 @@ RenderViewHostImpl* PrepareToDuplicateHosts(Shell* shell,
   WebContentsImpl* wc = static_cast<WebContentsImpl*>(shell->web_contents());
   wc->GetFrameTree()->root()->navigator()->RequestOpenURL(
       wc->GetFrameTree()->root()->current_frame_host(), extension_url, nullptr,
-      Referrer(), CURRENT_TAB, false, true);
+      Referrer(), ui::PAGE_TRANSITION_LINK, CURRENT_TAB, false, true);
 
   // Since the navigation above requires a cross-process swap, there will be a
   // pending RenderViewHost. Ensure it exists and is in a different process