Fix DCHECK in debug build when navigating to an unknown chrome://theme/ URL.

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 330 matching lines @@
 
   // Turns an integer result code into an Error and a count of bytes read.
   // The semantics are:
   //   |result| >= 0: |*error| == OK, |*count| == |result|
   //   |result| < 0: |*error| = |result|, |*count| == 0
   static void ConvertResultToError(int result, Error* error, int* count);
 
   // Completion callback for raw reads. See |ReadRawData| for details.
   // |bytes_read| is either >= 0 to indicate a successful read and count of
   // bytes read, or < 0 to indicate an error.
+  // On return, |this| may be deleted.
   void ReadRawDataComplete(int bytes_read);
 
   // The request that initiated this job. This value will never be nullptr.
   URLRequest* request_;
 
  private:
   // When data filtering is enabled, this function is used to read data
   // for the filter. Returns a net error code to indicate if raw data was
   // successfully read,  an error happened, or the IO is pending.
   Error ReadRawDataForFilter(int* bytes_read);
@@ skipping 98 matching lines @@
   int64_t last_notified_total_sent_bytes_;
 
   base::WeakPtrFactory<URLRequestJob> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(URLRequestJob);
 };
 
 }  // namespace net
 
 #endif  // NET_URL_REQUEST_URL_REQUEST_JOB_H_