chrome: Cleanup class/struct forward declarations

chrome/browser/android/foreign_session_helper.h

 // Copyright 2013 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_FOREIGN_SESSION_HELPER_H_
 #define CHROME_BROWSER_ANDROID_FOREIGN_SESSION_HELPER_H_
 
 #include <jni.h>
 
 #include "base/android/scoped_java_ref.h"
 #include "base/macros.h"
 #include "base/scoped_observer.h"
 #include "chrome/browser/profiles/profile.h"
 #include "components/sync/driver/sync_service_observer.h"
 
 using base::android::ScopedJavaLocalRef;
 
-struct SessionWindow;
-
-namespace browser_sync {
-struct SyncedSession;
-}  // namespace browser_sync
-
 namespace syncer {
 class SyncService;
 }  // namespace syncer
 
 class ForeignSessionHelper : public syncer::SyncServiceObserver {
  public:
   explicit ForeignSessionHelper(Profile* profile);
   void Destroy(JNIEnv* env, const base::android::JavaParamRef<jobject>& obj);
   jboolean IsTabSyncEnabled(JNIEnv* env,
                             const base::android::JavaParamRef<jobject>& obj);
@@ skipping 34 matching lines @@
 
   Profile* profile_;  // weak
   base::android::ScopedJavaGlobalRef<jobject> callback_;
   ScopedObserver<syncer::SyncService, syncer::SyncServiceObserver>
       scoped_observer_;
 
   DISALLOW_COPY_AND_ASSIGN(ForeignSessionHelper);
 };
 
 #endif  // CHROME_BROWSER_ANDROID_FOREIGN_SESSION_HELPER_H_