Refactor blacklist client into own .h/.cc.

chrome/browser/permissions/permission_blacklist_client.h

+// Copyright 2017 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_PERMISSIONS_PERMISSION_BLACKLIST_CLIENT_H_
+#define CHROME_BROWSER_PERMISSIONS_PERMISSION_BLACKLIST_CLIENT_H_
+
+#include "base/callback.h"
+#include "base/memory/ref_counted.h"
+#include "chrome/browser/permissions/permission_util.h"
+#include "components/safe_browsing_db/database_manager.h"
+#include "content/public/browser/permission_type.h"
+#include "content/public/browser/web_contents_observer.h"
+
+class GURL;
+
+namespace content {
+class WebContents;
+}
+
+namespace base {
+class OneShotTimer;
+}
+
+// The client used when checking whether a permission has been blacklisted by
+// Safe Browsing. The check is done asynchronously as no state can be stored in
+// PermissionContextBase (since additional permission requests may be made).
+// This class must be created and destroyed on the UI thread.
+class PermissionBlacklistClient
+    : public safe_browsing::SafeBrowsingDatabaseManager::Client,
+      public base::RefCountedThreadSafe<PermissionBlacklistClient>,
+      public content::WebContentsObserver {
+ public:
+  static void CheckSafeBrowsingBlacklist(
+      scoped_refptr<safe_browsing::SafeBrowsingDatabaseManager> db_manager,
+      content::PermissionType permission_type,
+      const GURL& request_origin,
+      content::WebContents* web_contents,
+      int timeout,
+      base::Callback<void(bool)> callback);
+
+ private:
+  friend class base::RefCountedThreadSafe<PermissionBlacklistClient>;
+
+  PermissionBlacklistClient(
+      scoped_refptr<safe_browsing::SafeBrowsingDatabaseManager> db_manager,
+      content::PermissionType permission_type,
+      const GURL& request_origin,
+      content::WebContents* web_contents,
+      int timeout,
+      base::Callback<void(bool)> callback);
+
+  ~PermissionBlacklistClient() override;
+
+  void StartCheck(const GURL& request_origin);
+
+  // SafeBrowsingDatabaseManager::Client implementation.
+  void OnCheckApiBlacklistUrlResult(
+      const GURL& url,
+      const safe_browsing::ThreatMetadata& metadata) override;
+
+  void EvaluateBlacklistResultOnUiThread(bool permission_blocked);
+
+  // WebContentsObserver implementation. Sets a flag so that when the database
+  // manager returns with a result, it won't attempt to run the callback with a
+  // deleted WebContents.
+  void WebContentsDestroyed() override;
+
+  scoped_refptr<safe_browsing::SafeBrowsingDatabaseManager> db_manager_;
+  content::PermissionType permission_type_;
+
+  // PermissionContextBase callback to run on the UI thread.
+  base::Callback<void(bool)> callback_;
+
+  // Timer to abort the Safe Browsing check if it takes too long. Created and
+  // used on the IO Thread.
+  std::unique_ptr<base::OneShotTimer> timer_;
+  int timeout_;
+
+  // True if |callback_| should be invoked, if web_contents() is destroyed, this
+  // is set to false.
+  bool is_active_;
+
+  DISALLOW_COPY_AND_ASSIGN(PermissionBlacklistClient);
+};
+
+#endif  // CHROME_BROWSER_PERMISSIONS_PERMISSION_BLACKLIST_CLIENT_H_