move file access permission logic to DownloadResourceThrottle

content/browser/android/download_controller_android_impl.h

 // Copyright (c) 2012 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.
 
 // This class pairs with DownloadController on Java side to forward requests
 // for GET downloads to the current DownloadListener. POST downloads are
 // handled on the native side.
 //
 // Both classes are Singleton classes. C++ object owns Java object.
 //
@@ skipping 38 matching lines @@
   static bool RegisterDownloadController(JNIEnv* env);
 
   // Called when DownloadController Java object is instantiated.
   void Init(JNIEnv* env, jobject obj);
 
   // Removes a deferred download from |deferred_downloads_|.
   void CancelDeferredDownload(DeferredDownloadObserver* observer);
 
   // DownloadControllerAndroid implementation.
   void AcquireFileAccessPermission(
-      WebContents* web_contents,
+      int render_process_id, int render_view_id,
       const AcquireFileAccessPermissionCallback& callback) override;
 
  private:
   // Used to store all the information about an Android download.
   struct DownloadInfoAndroid {
     explicit DownloadInfoAndroid(net::URLRequest* request);
     ~DownloadInfoAndroid();
 
     // The URL from which we are downloading. This is the final URL after any
     // redirection by the server for |original_url_|.
@@ skipping 59 matching lines @@
                                     int render_view_id,
                                     const DownloadInfoAndroid& info,
                                     bool allowed);
 
   // The download item contains dangerous file types.
   void OnDangerousDownload(DownloadItem *item);
 
   base::android::ScopedJavaLocalRef<jobject> GetContentViewCoreFromWebContents(
       WebContents* web_contents);
 
-  WebContents* GetWebContents(int render_process_id, int render_view_id);
-
   // Creates Java object if it is not created already and returns it.
   JavaObject* GetJavaObject();
 
   JavaObject* java_object_;
 
   ScopedVector<DeferredDownloadObserver> deferred_downloads_;
 
   DISALLOW_COPY_AND_ASSIGN(DownloadControllerAndroidImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_ANDROID_DOWNLOAD_CONTROLLER_ANDROID_IMPL_H_