chrome: Cleanup class/struct forward declarations

chrome/browser/bookmarks/chrome_bookmark_client.h

 // 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.
 
 #ifndef CHROME_BROWSER_BOOKMARKS_CHROME_BOOKMARK_CLIENT_H_
 #define CHROME_BROWSER_BOOKMARKS_CHROME_BOOKMARK_CLIENT_H_
 
 #include <set>
 #include <vector>
 
 #include "base/deferred_sequenced_task_runner.h"
 #include "base/macros.h"
 #include "build/build_config.h"
 #include "build/buildflag.h"
 #include "chrome/common/features.h"
 #include "components/bookmarks/browser/bookmark_client.h"
 
 class GURL;
 class Profile;
 
-namespace base {
-class ListValue;
-}
-
 namespace bookmarks {
 class BookmarkModel;
 class BookmarkNode;
 class BookmarkPermanentNode;
 class ManagedBookmarkService;
 }
 
 #if BUILDFLAG(ANDROID_JAVA_UI)
 namespace offline_pages {
 class OfflinePageBookmarkObserver;
@@ skipping 39 matching lines @@
 #if BUILDFLAG(ANDROID_JAVA_UI)
   // Owns the observer used by Offline Page listening to Bookmark Model events.
   std::unique_ptr<offline_pages::OfflinePageBookmarkObserver>
       offline_page_observer_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(ChromeBookmarkClient);
 };
 
 #endif  // CHROME_BROWSER_BOOKMARKS_CHROME_BOOKMARK_CLIENT_H_