Make PermissionRequestManager::requests_ correspond to the active prompt

chrome/browser/permissions/permission_prompt_android.cc

 // 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.
 
 #include "chrome/browser/permissions/permission_prompt_android.h"
 
 #include "base/memory/ptr_util.h"
 #include "chrome/browser/infobars/infobar_service.h"
 #include "chrome/browser/permissions/grouped_permission_infobar_delegate_android.h"
 #include "chrome/browser/permissions/permission_request.h"
@@ skipping 30 matching lines @@
 bool PermissionPromptAndroid::HidesAutomatically() {
   return true;
 }
 
 void PermissionPromptAndroid::Hide() {
   // Hide() is only called if HidesAutomatically() returns false or
   // CanAcceptRequestUpdate() return true.
   NOTREACHED();
 }
 
-bool PermissionPromptAndroid::IsVisible() {
-  return !requests_.empty();
-}
-
 void PermissionPromptAndroid::UpdateAnchorPosition() {
   NOTREACHED() << "UpdateAnchorPosition is not implemented";
 }
 
 gfx::NativeWindow PermissionPromptAndroid::GetNativeWindow() {
   NOTREACHED() << "GetNativeWindow is not implemented";
   return nullptr;
 }
 
 void PermissionPromptAndroid::Closing() {
@@ skipping 34 matching lines @@
     size_t position) const {
   DCHECK_LT(position, requests_.size());
   return requests_[position]->GetMessageTextFragment();
 }
 
 // static
 std::unique_ptr<PermissionPrompt> PermissionPrompt::Create(
     content::WebContents* web_contents) {
   return base::MakeUnique<PermissionPromptAndroid>(web_contents);
 }