Create/Destroy PermissionPromptAndroid when switching tabs on Android

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/media/webrtc/media_stream_devices_controller.h"
 #include "chrome/browser/permissions/grouped_permission_infobar_delegate_android.h"
 #include "chrome/browser/permissions/permission_request.h"
 #include "chrome/browser/permissions/permission_request_id.h"
 #include "components/infobars/core/infobar.h"
 #include "content/public/browser/web_contents.h"
 
 PermissionPromptAndroid::PermissionPromptAndroid(
     content::WebContents* web_contents)
     : web_contents_(web_contents), delegate_(nullptr), infobar_(nullptr) {
   DCHECK(web_contents);
 }
 
 PermissionPromptAndroid::~PermissionPromptAndroid() {
-  GroupedPermissionInfoBarDelegate* infobar_delegate =
-      static_cast<GroupedPermissionInfoBarDelegate*>(infobar_->delegate());
-  infobar_delegate->PermissionPromptDestroyed();
+  if (infobar_) {
+    GroupedPermissionInfoBarDelegate* infobar_delegate =
+        static_cast<GroupedPermissionInfoBarDelegate*>(infobar_->delegate());
+    infobar_delegate->PermissionPromptDestroyed();
+  }
 }
 
 void PermissionPromptAndroid::SetDelegate(Delegate* delegate) {
   delegate_ = delegate;
 }
 
 void PermissionPromptAndroid::Show(
     const std::vector<PermissionRequest*>& requests,
     const std::vector<bool>& values) {
   InfoBarService* infobar_service =
@@ skipping 49 matching lines @@
 void PermissionPromptAndroid::Deny() {
   if (delegate_)
     delegate_->Deny();
 }
 
 // static
 std::unique_ptr<PermissionPrompt> PermissionPrompt::Create(
     content::WebContents* web_contents) {
   return base::MakeUnique<PermissionPromptAndroid>(web_contents);
 }