Make PermissionRequestManager::requests_ correspond to the active prompt

chrome/browser/ui/views/permission_bubble/permission_prompt_impl.h

 // Copyright 2014 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_VIEWS_PERMISSION_BUBBLE_PERMISSION_PROMPT_IMPL_H_
 #define CHROME_BROWSER_UI_VIEWS_PERMISSION_BUBBLE_PERMISSION_PROMPT_IMPL_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 16 matching lines @@
   explicit PermissionPromptImpl(Browser* browser);
   ~PermissionPromptImpl() 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;
 
   void Closing();
   void ToggleAccept(int index, bool value);
   void TogglePersist(bool value);
   void Accept();
   void Deny();
 
   Profile* GetProfile();
@@ skipping 11 matching lines @@
   views::BubbleBorder::Arrow GetAnchorArrow();
 
   Browser* browser_;
   Delegate* delegate_;
   PermissionsBubbleDialogDelegateView* bubble_delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(PermissionPromptImpl);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_PERMISSION_BUBBLE_PERMISSION_PROMPT_IMPL_H_