Fix the no password save issue for ajax login

content/public/renderer/document_state.h

Index: content/public/renderer/document_state.h
diff --git a/content/public/renderer/document_state.h b/content/public/renderer/document_state.h
index 3168776091b29b201cc96eb423520d007bce50b2..075cda010e98cc31e9e2125cb7ab148e1c227f62 100644
--- a/content/public/renderer/document_state.h
+++ b/content/public/renderer/document_state.h
@@ -169,6 +169,10 @@ class DocumentState : public WebKit::WebDataSource::ExtraData {
     searchable_form_encoding_ = encoding;
   }
 
+  // If set, contains the PasswordForm that we believe triggered the current
+  // navigation (there is some ambiguity in the case of javascript initiated
+  // navigations). This information is used by the PasswordManager to determine
+  // if the user should be prompted to save their password.
   PasswordForm* password_form_data() const {
     return password_form_data_.get();
   }