Reland https://codereview.chromium.org/1271593002/ which was reverted

net/url_request/url_request_simple_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_SIMPLE_JOB_H_
 #define NET_URL_REQUEST_URL_REQUEST_SIMPLE_JOB_H_
 
 #include <string>
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "base/strings/string_piece.h"
 #include "net/base/completion_callback.h"
 #include "net/base/net_export.h"
 #include "net/url_request/url_range_request_job.h"
 
 namespace base {
 class RefCountedMemory;
 }
 
 namespace net {
 
 class URLRequest;
 
 class NET_EXPORT URLRequestSimpleJob : public URLRangeRequestJob {
  public:
   URLRequestSimpleJob(URLRequest* request, NetworkDelegate* network_delegate);
 
   void Start() override;
+  void Kill() override;
   bool ReadRawData(IOBuffer* buf, int buf_size, int* bytes_read) override;
   bool GetMimeType(std::string* mime_type) const override;
   bool GetCharset(std::string* charset) override;
 
  protected:
   ~URLRequestSimpleJob() override;
 
   // Subclasses must override either GetData or GetRefCountedData to define the
   // way response data is determined.
   // The return value should be:
@@ skipping 32 matching lines @@
   std::string charset_;
   scoped_refptr<base::RefCountedMemory> data_;
   int64 next_data_offset_;
   scoped_refptr<base::TaskRunner> task_runner_;
   base::WeakPtrFactory<URLRequestSimpleJob> weak_factory_;
 };
 
 }  // namespace net
 
 #endif  // NET_URL_REQUEST_URL_REQUEST_SIMPLE_JOB_H_