chrome: Cleanup class/struct forward declarations

chrome/browser/ui/android/infobars/infobar_container_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_CONTAINER_ANDROID_H_
 #define CHROME_BROWSER_UI_ANDROID_INFOBARS_INFOBAR_CONTAINER_ANDROID_H_
 
 #include <stddef.h>
 
 #include <map>
 #include <string>
 
 #include "base/android/jni_weak_ref.h"
 #include "base/android/scoped_java_ref.h"
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "components/infobars/core/infobar_container.h"
 
 class InfoBarAndroid;
 
-namespace content {
-class WebContents;
-}
-
 class InfoBarContainerAndroid : public infobars::InfoBarContainer {
  public:
   InfoBarContainerAndroid(JNIEnv* env,
                           jobject infobar_container);
   void SetWebContents(JNIEnv* env,
                       const base::android::JavaParamRef<jobject>& obj,
                       const base::android::JavaParamRef<jobject>& web_contents);
   void Destroy(JNIEnv* env, const base::android::JavaParamRef<jobject>& obj);
 
   JavaObjectWeakGlobalRef java_container() const {
@@ skipping 18 matching lines @@
   // us.
   JavaObjectWeakGlobalRef weak_java_infobar_container_;
 
   DISALLOW_COPY_AND_ASSIGN(InfoBarContainerAndroid);
 };
 
 // Registers the InfoBarContainer's native methods through JNI.
 bool RegisterInfoBarContainer(JNIEnv* env);
 
 #endif  // CHROME_BROWSER_UI_ANDROID_INFOBARS_INFOBAR_CONTAINER_ANDROID_H_