chrome: Cleanup class/struct forward declarations

chrome/browser/chrome_content_browser_client.h

 // Copyright (c) 2012 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_CHROME_CONTENT_BROWSER_CLIENT_H_
 #define CHROME_BROWSER_CHROME_CONTENT_BROWSER_CLIENT_H_
 
 #include <stddef.h>
 
 #include <memory>
@@ skipping 14 matching lines @@
 
 namespace base {
 class CommandLine;
 }
 
 namespace content {
 class BrowserContext;
 class QuotaPermissionContext;
 }
 
-namespace extensions {
-class BrowserPermissionsPolicyDelegate;
-}
-
 namespace user_prefs {
 class PrefRegistrySyncable;
 }
 
 namespace version_info {
 enum class Channel;
 }
 
 namespace url {
 class Origin;
@@ skipping 316 matching lines @@
   // Vector of additional ChromeContentBrowserClientParts.
   // Parts are deleted in the reverse order they are added.
   std::vector<ChromeContentBrowserClientParts*> extra_parts_;
 
   base::WeakPtrFactory<ChromeContentBrowserClient> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeContentBrowserClient);
 };
 
 #endif  // CHROME_BROWSER_CHROME_CONTENT_BROWSER_CLIENT_H_