chrome: Cleanup class/struct forward declarations

chrome/browser/android/offline_pages/evaluation/offline_page_evaluation_bridge.h

 // 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.
 
 #ifndef CHROME_BROWSER_ANDROID_OFFLINE_PAGES_EVALUATION_OFFLINE_PAGE_EVALUATION_BRIDGE_H_
 #define CHROME_BROWSER_ANDROID_OFFLINE_PAGES_EVALUATION_OFFLINE_PAGE_EVALUATION_BRIDGE_H_
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_weak_ref.h"
 #include "base/android/scoped_java_ref.h"
 #include "base/macros.h"
 #include "components/offline_pages/background/request_coordinator.h"
 #include "components/offline_pages/background/request_notifier.h"
 #include "components/offline_pages/offline_page_model.h"
 
 namespace content {
 class BrowserContext;
 }
 
 namespace offline_pages {
 
-struct OfflinePageItem;
-
 namespace android {
 
 /**
  * Bridge for exposing native implementation which are used by evaluation.
  */
 class OfflinePageEvaluationBridge : public OfflinePageModel::Observer,
                                     public RequestCoordinator::Observer {
  public:
   static bool Register(JNIEnv* env);
   static std::unique_ptr<KeyedService> GetTestingRequestCoordinator(
@@ skipping 67 matching lines @@
   // Not owned.
   RequestCoordinator* request_coordinator_;
 
   DISALLOW_COPY_AND_ASSIGN(OfflinePageEvaluationBridge);
 };
 
 }  // namespace android
 }  // namespace offline_pages
 
 #endif  // CHROME_BROWSER_ANDROID_OFFLINE_PAGES_EVALUATION_OFFLINE_PAGE_EVALUATION_BRIDGE_H_