Revert of Remove Referrer Policy from URLFetcher.

net/url_request/url_fetcher.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_FETCHER_H_
 #define NET_URL_REQUEST_URL_FETCHER_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 153 matching lines @@
   // called before the request is started.
   virtual void SetLoadFlags(int load_flags) = 0;
 
   // Returns the current load flags.
   virtual int GetLoadFlags() const = 0;
 
   // The referrer URL for the request. Must be called before the request is
   // started.
   virtual void SetReferrer(const std::string& referrer) = 0;
 
+  // The referrer policy to apply when updating the referrer during redirects.
+  // The referrer policy may only be changed before Start() is called.
+  virtual void SetReferrerPolicy(
+      URLRequest::ReferrerPolicy referrer_policy) = 0;
+
   // Set extra headers on the request.  Must be called before the request
   // is started.
   // This replaces the entire extra request headers.
   virtual void SetExtraRequestHeaders(
       const std::string& extra_request_headers) = 0;
 
   // Add header (with format field-name ":" [ field-value ]) to the request
   // headers.  Must be called before the request is started.
   // This appends the header to the current extra request headers.
   virtual void AddExtraRequestHeader(const std::string& header_line) = 0;
@@ skipping 108 matching lines @@
   // be removed once the URLFetcher is destroyed.  User should not take
   // ownership more than once, or call this method after taking ownership.
   virtual bool GetResponseAsFilePath(
       bool take_ownership,
       base::FilePath* out_response_path) const = 0;
 };
 
 }  // namespace net
 
 #endif  // NET_URL_REQUEST_URL_FETCHER_H_