Remove RenderFrameHost pointer from ChooserController.

chrome/browser/chooser_controller/chooser_controller.h

Index: chrome/browser/chooser_controller/chooser_controller.h
diff --git a/chrome/browser/chooser_controller/chooser_controller.h b/chrome/browser/chooser_controller/chooser_controller.h
index 6b2e1f415d407a062c4a09f4f31f83edf2f4e30c..33658c6ee8e405e567eb169f751bb35c030b7af3 100644
--- a/chrome/browser/chooser_controller/chooser_controller.h
+++ b/chrome/browser/chooser_controller/chooser_controller.h
@@ -131,9 +131,7 @@ class ChooserController {
   View* view() const { return view_; }
 
  private:
-  content::RenderFrameHost* const owning_frame_;
-  const int title_string_id_origin_;
-  const int title_string_id_extension_;
+  base::string16 title_;
   View* view_ = nullptr;
 
   DISALLOW_COPY_AND_ASSIGN(ChooserController);