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 52 matching lines @@
   // in progress, so we are able to pass those bytes to job observers.
   scoped_refptr<IOBuffer> raw_read_buffer_;
 
   // Used by HandleResponseIfNecessary to track whether we've sent the
   // OnResponseStarted callback and potentially redirect callbacks as well.
   bool has_handled_response_;
 
   // Expected content size
   int64_t expected_content_size_;
 
-  // Set when a redirect is deferred.
+  // Set when a redirect is deferred. Redirects are deferred after validity
+  // checks are performed, so this field must not be modified.
   RedirectInfo deferred_redirect_info_;
 
   // The network delegate to use with this request, if any.
   NetworkDelegate* network_delegate_;
 
   // The value from GetTotalReceivedBytes() the last time
   // MaybeNotifyNetworkBytes() was called. Used to calculate how bytes have been
   // newly received since the last notification.
   int64_t last_notified_total_received_bytes_;
 
   // The value from GetTotalSentBytes() the last time MaybeNotifyNetworkBytes()
   // was called. Used to calculate how bytes have been newly sent since the last
   // notification.
   int64_t last_notified_total_sent_bytes_;
 
   // Non-null if ReadRawData() returned ERR_IO_PENDING, and the read has not
   // completed.
   CompletionCallback read_raw_callback_;
 
   base::WeakPtrFactory<URLRequestJob> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(URLRequestJob);
 };
 
 }  // namespace net
 
 #endif  // NET_URL_REQUEST_URL_REQUEST_JOB_H_