chrome: Cleanup class/struct forward declarations

chrome/browser/android/signin/signin_manager_android.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_SIGNIN_SIGNIN_MANAGER_ANDROID_H_
 #define CHROME_BROWSER_ANDROID_SIGNIN_SIGNIN_MANAGER_ANDROID_H_
 
 #include <jni.h>
 
 #include <memory>
 #include <string>
 
 #include "base/android/scoped_java_ref.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "base/threading/thread_checker.h"
 #include "components/prefs/pref_change_registrar.h"
 #include "components/signin/core/browser/signin_manager_base.h"
 
 class Profile;
 
-namespace policy {
-class CloudPolicyClient;
-}
-
 // Android wrapper of the SigninManager which provides access from the Java
 // layer. Note that on Android, there's only a single profile, and therefore
 // a single instance of this wrapper. The name of the Java class is
 // SigninManager.
 // This class should only be accessed from the UI thread.
 //
 // This class implements parts of the sign-in flow, to make sure that policy
 // is available before sign-in completes.
 class SigninManagerAndroid : public SigninManagerBase::Observer {
  public:
@@ skipping 81 matching lines @@
   PrefChangeRegistrar pref_change_registrar_;
 
   base::ThreadChecker thread_checker_;
 
   base::WeakPtrFactory<SigninManagerAndroid> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(SigninManagerAndroid);
 };
 
 #endif  // CHROME_BROWSER_ANDROID_SIGNIN_SIGNIN_MANAGER_ANDROID_H_