[Image Fetcher] Add support to disable cookies

components/image_fetcher/image_data_fetcher.h

 // Copyright 2016 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 COMPONENTS_IMAGE_FETCHER_IMAGE_DATA_FETCHER_H_
 #define COMPONENTS_IMAGE_FETCHER_IMAGE_DATA_FETCHER_H_
 
 #include <map>
 #include <memory>
 #include <string>
@@ skipping 31 matching lines @@
 
   using DataUseServiceName = data_use_measurement::DataUseUserData::ServiceName;
 
   explicit ImageDataFetcher(
       net::URLRequestContextGetter* url_request_context_getter);
   ~ImageDataFetcher() override;
 
   // Sets a service name against which to track data usage.
   void SetDataUseServiceName(DataUseServiceName data_use_service_name);
 
+  // Disables sending cookies together with the HTTP request.
+  void DisableCookies();

[Marc Treib, 2017/03/16 10:04:56]

I prefer formulating things positively: EnableCookies(bool), or
SetCookiesAllowed(bool)

+
   // Fetches the raw image bytes from the given |image_url| and calls the given
   // |callback|. The callback is run even if fetching the URL fails. In case
   // of an error an empty string is passed to the callback.
   void FetchImageData(const GURL& image_url,
                       const ImageDataFetcherCallback& callback);
 
   // Like above, but lets the caller set a referrer.
   void FetchImageData(const GURL& image_url,
                       const ImageDataFetcherCallback& callback,
                       const std::string& referrer,
@@ skipping 13 matching lines @@
 
   DataUseServiceName data_use_service_name_;
 
   // The next ID to use for a newly created URLFetcher. Each URLFetcher gets an
   // id when it is created. The |url_fetcher_id_| is incremented by one for each
   // newly created URLFetcher. The URLFetcher ID can be used during testing to
   // get individual URLFetchers and modify their state. Outside of tests this ID
   // is not used.
   int next_url_fetcher_id_;
 
+  bool disable_cookies_;
+
   DISALLOW_COPY_AND_ASSIGN(ImageDataFetcher);
 };
 
 }  // namespace image_fetcher
 
 #endif  // COMPONENTS_IMAGE_FETCHER_IMAGE_DATA_FETCHER_H_