chrome: Cleanup class/struct forward declarations

chrome/browser/android/background_sync_launcher_android.h

 // Copyright 2015 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_BACKGROUND_SYNC_LAUNCHER_ANDROID_H_
 #define CHROME_BROWSER_ANDROID_BACKGROUND_SYNC_LAUNCHER_ANDROID_H_
 
 #include <stdint.h>
 
 #include <set>
 
 #include "base/android/jni_android.h"
 #include "base/lazy_instance.h"
 #include "base/macros.h"
 
-namespace content {
-
-class BackgroundSyncManager;
-
-}
-
 // The BackgroundSyncLauncherAndroid singleton owns the Java
 // BackgroundSyncLauncher object and is used to register interest in starting
 // the browser the next time the device goes online. This class runs on the UI
 // thread.
 class BackgroundSyncLauncherAndroid {
  public:
   static BackgroundSyncLauncherAndroid* Get();
 
   static void LaunchBrowserIfStopped(bool launch_when_next_online,
                                      int64_t min_delay_ms);
@@ skipping 12 matching lines @@
   ~BackgroundSyncLauncherAndroid();
 
   void LaunchBrowserIfStoppedImpl(bool launch_when_next_online,
                                   int64_t min_delay_ms);
 
   base::android::ScopedJavaGlobalRef<jobject> java_launcher_;
   DISALLOW_COPY_AND_ASSIGN(BackgroundSyncLauncherAndroid);
 };
 
 #endif  // CHROME_BROWSER_ANDROID_BACKGROUND_SYNC_LAUNCHER_ANDROID_H_