To fix the cross-site post submission bug.

chrome/browser/ui/browser_navigator.cc

Index: chrome/browser/ui/browser_navigator.cc
diff --git a/chrome/browser/ui/browser_navigator.cc b/chrome/browser/ui/browser_navigator.cc
index 80fb7d5cf68f1c3418539457d4db426a48e17672..cb741902ffd98fa670ce4fb5a7e698fd0c1cc7e6 100644
--- a/chrome/browser/ui/browser_navigator.cc
+++ b/chrome/browser/ui/browser_navigator.cc
@@ -235,6 +235,12 @@ void LoadURLInContents(WebContents* target_contents,
   } else if (params->is_renderer_initiated) {
     load_url_params.is_renderer_initiated = true;
   }
+  if (params->transition == content::PAGE_TRANSITION_FORM_SUBMIT) {
+    load_url_params.load_type =
+        content::NavigationController::LOAD_TYPE_BROWSER_INITIATED_HTTP_POST;
+    load_url_params.browser_initiated_post_data =
+        params->browser_initiated_post_data;
+  }
   target_contents->GetController().LoadURLWithParams(load_url_params);
 }