Use set_allow_credentials instead of LOAD_DO_NOT_* in net/reporting

This CL comes with a behavior change: set_allow_credentials(false)
additionally sets LOAD_DO_NOT_SEND_AUTH_DATA. However, this would only
matter if the origin server actually used HTTP auth.

Bug: 799935
Change-Id: I764586d72b69c1a24d4981a4a5ba1127bf4e91aa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1752622
Commit-Queue: David Benjamin <davidben@chromium.org>
Commit-Queue: Matt Menke <mmenke@chromium.org>
Auto-Submit: David Benjamin <davidben@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#686556}

net/reporting/reporting_uploader.cc

@@ -169,9 +169,8 @@ class ReportingUploaderImpl : public ReportingUploader, URLRequest::Delegate {
 
     upload->request->set_method("OPTIONS");
 
-    upload->request->SetLoadFlags(LOAD_DISABLE_CACHE |
-                                  LOAD_DO_NOT_SAVE_COOKIES |
-                                  LOAD_DO_NOT_SEND_COOKIES);
+    upload->request->SetLoadFlags(LOAD_DISABLE_CACHE);
+    upload->request->set_allow_credentials(false);
 
     upload->request->SetExtraRequestHeaderByName(
         HttpRequestHeaders::kOrigin, upload->report_origin.Serialize(), true);
@@ -201,9 +200,8 @@ class ReportingUploaderImpl : public ReportingUploader, URLRequest::Delegate {
 
     upload->request->set_method("POST");
 
-    upload->request->SetLoadFlags(LOAD_DISABLE_CACHE |
-                                  LOAD_DO_NOT_SAVE_COOKIES |
-                                  LOAD_DO_NOT_SEND_COOKIES);
+    upload->request->SetLoadFlags(LOAD_DISABLE_CACHE);
+    upload->request->set_allow_credentials(false);
 
     upload->request->SetExtraRequestHeaderByName(
         HttpRequestHeaders::kContentType, kUploadContentType, true);