Make PermissionRequestManager::requests_ correspond to the active prompt

chrome/browser/ui/cocoa/permission_bubble/permission_bubble_cocoa.mm

 // 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.
 
 #include "chrome/browser/ui/cocoa/permission_bubble/permission_bubble_cocoa.h"
 
 #include "base/memory/ptr_util.h"
 #import "chrome/browser/ui/cocoa/base_bubble_controller.h"
 #import "chrome/browser/ui/cocoa/permission_bubble/permission_bubble_controller.h"
 #import "chrome/browser/ui/permission_bubble/permission_prompt.h"
@@ skipping 19 matching lines @@
 
   [bubbleController_ showWithDelegate:delegate_
                           forRequests:requests
                          acceptStates:accept_state];
 }
 
 void PermissionBubbleCocoa::Hide() {
   [bubbleController_ close];
 }
 
-bool PermissionBubbleCocoa::IsVisible() {
-  return bubbleController_ != nil;
-}
-
 void PermissionBubbleCocoa::SetDelegate(Delegate* delegate) {
   if (delegate_ == delegate)
     return;
   delegate_ = delegate;
 }
 
 bool PermissionBubbleCocoa::CanAcceptRequestUpdate() {
   return ![[[bubbleController_ window] contentView] cr_isMouseInView];
 }
 
 bool PermissionBubbleCocoa::HidesAutomatically() {
   return false;
 }
 
 void PermissionBubbleCocoa::UpdateAnchorPosition() {
   [bubbleController_ updateAnchorPosition];
 }
 
 gfx::NativeWindow PermissionBubbleCocoa::GetNativeWindow() {
   return [bubbleController_ window];
 }
 
 void PermissionBubbleCocoa::OnBubbleClosing() {
   bubbleController_ = nil;
 }