Change ChooserController ownership model

components/chooser_controller/chooser_controller.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef COMPONENTS_CHOOSER_CONTROLLER_CHOOSER_CONTROLLER_H_
 #define COMPONENTS_CHOOSER_CONTROLLER_CHOOSER_CONTROLLER_H_
 
 #include "base/macros.h"
 #include "base/strings/string16.h"
 
@@ skipping 65 matching lines @@
   virtual void Close() = 0;
 
   // Open help center URL.
   virtual void OpenHelpCenterUrl() const = 0;
 
   // Only one observer may be registered at a time.
   void set_observer(Observer* observer) { observer_ = observer; }
   Observer* observer() const { return observer_; }
 
  private:
-  const content::RenderFrameHost* const owning_frame_;
+  content::RenderFrameHost* owning_frame_;
   Observer* observer_ = nullptr;
 
   DISALLOW_COPY_AND_ASSIGN(ChooserController);
 };
 
 #endif  // COMPONENTS_CHOOSER_CONTROLLER_CHOOSER_CONTROLLER_H_