chrome: Cleanup class/struct forward declarations

chrome/browser/android/webapps/add_to_homescreen_manager.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_WEBAPPS_ADD_TO_HOMESCREEN_MANAGER_H_
 #define CHROME_BROWSER_ANDROID_WEBAPPS_ADD_TO_HOMESCREEN_MANAGER_H_
 
 #include "base/android/jni_android.h"
 #include "base/android/scoped_java_ref.h"
 #include "base/macros.h"
 #include "chrome/browser/android/webapps/add_to_homescreen_data_fetcher.h"
 
 namespace content {
 class WebContents;
 }
 
-namespace IPC {
-class Message;
-}
-
 class GURL;
 class SkBitmap;
 struct ShortcutInfo;
 
 // AddToHomescreenManager is the C++ counterpart of
 // org.chromium.chrome.browser's AddToHomescreenManager in Java. The object
 // is owned by the Java object. It is created from there via a JNI
 // (InitializeAndStart) call and MUST BE DESTROYED via Destroy().
 class AddToHomescreenManager : public AddToHomescreenDataFetcher::Observer {
  public:
@@ skipping 47 matching lines @@
   // Whether the site is WebAPK-compatible.
   bool is_webapk_compatible_;
 
   // Fetches data required to add a shortcut.
   scoped_refptr<AddToHomescreenDataFetcher> data_fetcher_;
 
   DISALLOW_COPY_AND_ASSIGN(AddToHomescreenManager);
 };
 
 #endif  // CHROME_BROWSER_ANDROID_WEBAPPS_ADD_TO_HOMESCREEN_MANAGER_H_