chrome: Cleanup class/struct forward declarations

chrome/browser/ui/android/infobars/infobar_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_UI_ANDROID_INFOBARS_INFOBAR_ANDROID_H_
 #define CHROME_BROWSER_UI_ANDROID_INFOBARS_INFOBAR_ANDROID_H_
 
 #include <string>
 
 #include "base/android/scoped_java_ref.h"
 #include "base/macros.h"
 #include "components/infobars/core/infobar.h"
 
-class InfoBarService;
-
 namespace infobars {
 class InfoBarDelegate;
 }
 
 class InfoBarAndroid : public infobars::InfoBar {
  public:
 
   // A Java counterpart will be generated for this enum.
   // GENERATED_JAVA_ENUM_PACKAGE: org.chromium.chrome.browser.infobar
   // GENERATED_JAVA_PREFIX_TO_STRIP: ACTION_
@@ skipping 52 matching lines @@
  private:
   base::android::ScopedJavaGlobalRef<jobject> java_info_bar_;
 
   DISALLOW_COPY_AND_ASSIGN(InfoBarAndroid);
 };
 
 // Registers the NativeInfoBar's native methods through JNI.
 bool RegisterNativeInfoBar(JNIEnv* env);
 
 #endif  // CHROME_BROWSER_UI_ANDROID_INFOBARS_INFOBAR_ANDROID_H_