[Image Fetcher] Add support to disable cookies

components/image_fetcher/image_data_fetcher.cc

Index: components/image_fetcher/image_data_fetcher.cc
diff --git a/components/image_fetcher/image_data_fetcher.cc b/components/image_fetcher/image_data_fetcher.cc
index 204fa95d7e80df557d859271fbe6674c3df7b2bc..56e55ddaccc0a37902f87abcc1d6c8b218f64a2a 100644
--- a/components/image_fetcher/image_data_fetcher.cc
+++ b/components/image_fetcher/image_data_fetcher.cc
@@ -70,6 +70,9 @@ void ImageDataFetcher::FetchImageData(
   request->url_fetcher->SetRequestContext(url_request_context_getter_.get());
   request->url_fetcher->SetReferrer(referrer);
   request->url_fetcher->SetReferrerPolicy(referrer_policy);
+  request->url_fetcher->SetLoadFlags(net::LOAD_DO_NOT_SEND_COOKIES |
+                                     net::LOAD_DO_NOT_SAVE_COOKIES |
+                                     net::LOAD_DO_NOT_SEND_AUTH_DATA);
   request->url_fetcher->Start();
 
   pending_requests_[request->url_fetcher.get()] = std::move(request);