OOR-CORS: Stop setting |resource_type| for the CORS preflight

This is not required, but set for the non-NetworkService code
path that does not exist any more.

Change-Id: If282d1c49894302c0da22a7ecda4168afb4277c3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1771370
Auto-Submit: Takashi Toyoshima <toyoshim@chromium.org>
Commit-Queue: Yutaka Hirano <yhirano@chromium.org>
Reviewed-by: Yutaka Hirano <yhirano@chromium.org>
Cr-Commit-Position: refs/heads/master@{#690341}

services/network/cors/preflight_controller.cc

@@ -110,10 +110,6 @@ std::unique_ptr<ResourceRequest> CreatePreflightRequest(
       net::HttpRequestHeaders::kOrigin,
       (tainted ? url::Origin() : *request.request_initiator).Serialize());
 
-  // TODO(toyoshim): Should not matter, but at this moment, it hits a sanity
-  // check in ResourceDispatcherHostImpl if |resource_type| isn't set.
-  preflight_request->resource_type = request.resource_type;
-
   return preflight_request;
 }