Make PermissionRequestManager::requests_ correspond to the active prompt

chrome/browser/ui/permission_bubble/mock_permission_prompt.h

 // Copyright 2015 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 CHROME_BROWSER_UI_PERMISSION_BUBBLE_MOCK_PERMISSION_PROMPT_H_
 #define CHROME_BROWSER_UI_PERMISSION_BUBBLE_MOCK_PERMISSION_PROMPT_H_
 
 #include "chrome/browser/ui/permission_bubble/permission_prompt.h"
 
 class MockPermissionPromptFactory;
 class PermissionRequestManager;
 
 // Provides a skeleton class for unit and browser testing when trying to test
 // the request manager logic. Should not be used for anything that requires
 // actual UI.
 // Use the MockPermissionPromptFactory to create this.
 class MockPermissionPrompt : public PermissionPrompt {
  public:
   ~MockPermissionPrompt() override;
 
   // PermissionPrompt:
   void SetDelegate(Delegate* delegate) override {}
   void Show(const std::vector<PermissionRequest*>& requests,
             const std::vector<bool>& accept_state) override;
   bool CanAcceptRequestUpdate() override;
   bool HidesAutomatically() override;
   void Hide() override;
-  bool IsVisible() override;
   void UpdateAnchorPosition() override;
   gfx::NativeWindow GetNativeWindow() override;
 
+  bool IsVisible();
+
  private:
   friend class MockPermissionPromptFactory;
 
   MockPermissionPrompt(MockPermissionPromptFactory* factory,
                        PermissionRequestManager* manager);
 
   MockPermissionPromptFactory* factory_;
   PermissionRequestManager* manager_;
   bool can_update_ui_;
   bool is_visible_;
 };
 
 #endif  // CHROME_BROWSER_UI_PERMISSION_BUBBLE_MOCK_PERMISSION_PROMPT_H_