Perform redirect checks before OnReceivedRedirect in //net.

net/url_request/url_request_job.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.
 
 #ifndef NET_URL_REQUEST_URL_REQUEST_JOB_H_
 #define NET_URL_REQUEST_URL_REQUEST_JOB_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 327 matching lines @@
   // completed. |synchronous| true if the read completed synchronously.
   // See the documentation for |Read| above for the contract of this method.
   void SourceStreamReadComplete(bool synchronous, int result);
 
   // Invokes ReadRawData and records bytes read if the read completes
   // synchronously.
   int ReadRawDataHelper(IOBuffer* buf,
                         int buf_size,
                         const CompletionCallback& callback);
 
+  // Returns OK if |new_url| is a valid redirect target and an error code
+  // otherwise.
+  int CanFollowRedirect(const GURL& new_url);
+
   // Called in response to a redirect that was not canceled to follow the
   // redirect. The current job will be replaced with a new job loading the
   // given redirect destination.
   void FollowRedirect(const RedirectInfo& redirect_info);
 
   // Called after every raw read. If |bytes_read| is > 0, this indicates
   // a successful read of |bytes_read| unfiltered bytes. If |bytes_read|
   // is 0, this indicates that there is no additional data to read.
   // If |bytes_read| is negative, no bytes were read.
   void GatherRawReadStats(int bytes_read);
@@ skipping 80 matching lines @@
   CompletionCallback read_raw_callback_;
 
   base::WeakPtrFactory<URLRequestJob> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(URLRequestJob);
 };
 
 }  // namespace net
 
 #endif  // NET_URL_REQUEST_URL_REQUEST_JOB_H_