[Image Fetcher] Add support to disable cookies

components/image_fetcher/image_data_fetcher.h

Index: components/image_fetcher/image_data_fetcher.h
diff --git a/components/image_fetcher/image_data_fetcher.h b/components/image_fetcher/image_data_fetcher.h
index d05ec3d4bb55812189e7a024a0d728c0f04caae3..71177cea09d43a5d542d8657f715ef9bb876aa67 100644
--- a/components/image_fetcher/image_data_fetcher.h
+++ b/components/image_fetcher/image_data_fetcher.h
@@ -49,6 +49,9 @@ class ImageDataFetcher : public net::URLFetcherDelegate {
   // 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.
@@ -82,6 +85,8 @@ class ImageDataFetcher : public net::URLFetcherDelegate {
   // is not used.
   int next_url_fetcher_id_;
 
+  bool disable_cookies_;
+
   DISALLOW_COPY_AND_ASSIGN(ImageDataFetcher);
 };