To fix the cross-site post submission bug.

chrome/browser/ui/browser.cc

Index: chrome/browser/ui/browser.cc
diff --git a/chrome/browser/ui/browser.cc b/chrome/browser/ui/browser.cc
index b8aa442c0c3a836e63d3b26977195c450729e6fa..d9b85666e42ad6f3dc6867191ca2659b7001e322 100644
--- a/chrome/browser/ui/browser.cc
+++ b/chrome/browser/ui/browser.cc
@@ -1316,6 +1316,11 @@ WebContents* Browser::OpenURLFromTab(WebContents* source,
   nav_params.transferred_global_request_id =
       params.transferred_global_request_id;
   nav_params.is_cross_site_redirect = params.is_cross_site_redirect;
+
+  if (params.transition == content::PAGE_TRANSITION_FORM_SUBMIT) {
+    nav_params.post_data = params.browser_initiated_post_data;
+  }
+
   chrome::Navigate(&nav_params);
 
   return nav_params.target_contents ?