chrome: Cleanup class/struct forward declarations

chrome/browser/android/browsing_data/browsing_data_counter_bridge.h

 // Copyright 2016 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_BROWSING_DATA_BROWSING_DATA_COUNTER_BRIDGE_H_
 #define CHROME_BROWSER_ANDROID_BROWSING_DATA_BROWSING_DATA_COUNTER_BRIDGE_H_
 
 #include "base/android/jni_weak_ref.h"
 #include "base/android/scoped_java_ref.h"
 #include "components/browsing_data/core/counters/browsing_data_counter.h"
 
-class Profile;
-
 // This class is a wrapper for BrowsingDataCounter (C++ backend) to be used by
 // ClearBrowsingDataFragment (Java UI).
 class BrowsingDataCounterBridge {
  public:
   // Creates a BrowsingDataCounterBridge for a certain browsing data type.
   // The |data_type| is a value of the enum BrowsingDataType.
   BrowsingDataCounterBridge(
       JNIEnv* env,
       const base::android::JavaParamRef<jobject>& obj,
       jint data_type);
 
   ~BrowsingDataCounterBridge();
 
   // Called by the Java counterpart when it is getting garbage collected.
   void Destroy(JNIEnv* env, const base::android::JavaParamRef<jobject>& obj);
 
   static bool Register(JNIEnv* env);
 
  private:
   void onCounterFinished(
       std::unique_ptr<browsing_data::BrowsingDataCounter::Result> result);
 
   base::android::ScopedJavaGlobalRef<jobject> jobject_;
   std::unique_ptr<browsing_data::BrowsingDataCounter> counter_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowsingDataCounterBridge);
 };
 
 #endif // CHROME_BROWSER_ANDROID_BROWSING_DATA_BROWSING_DATA_COUNTER_BRIDGE_H_