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 8d541fb08b5cee98095693c36ec4de0c1628af5d..bc91e8ac5e6364397f5993181a597b7cee8e6a53 100644
--- a/chrome/browser/ui/browser.cc
+++ b/chrome/browser/ui/browser.cc
@@ -1292,6 +1292,11 @@ WebContents* Browser::OpenURLFromTab(WebContents* source,
   nav_params.is_renderer_initiated = params.is_renderer_initiated;
   nav_params.transferred_global_request_id =
       params.transferred_global_request_id;
+  // set post data
+  if (params.transition == content::PAGE_TRANSITION_FORM_SUBMIT) {
+    nav_params.browser_initiated_post_data = params.browser_initiated_post_data;
+  }
+
   chrome::Navigate(&nav_params);
 
   return nav_params.target_contents ?