Remove a TODO comment in NavigationURLLoader

The base url and history url have already been set appropriately.

TBR=kinuko@chromium.org

Bug: 846196
Change-Id: Ib0da047983f19c781dbf5e6d6bce3acda8006bda
Reviewed-on: https://chromium-review.googlesource.com/1104079Reviewed-by: Makoto Shimazu <shimazu@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Makoto Shimazu <shimazu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#568737}

content/browser/loader/navigation_url_loader_impl.cc

@@ -266,7 +266,6 @@ std::unique_ptr<NavigationRequestInfo> CreateNavigationRequestInfoForRedirect(
                    updated_resource_request.referrer_policy));
   new_common_params.method = updated_resource_request.method;
   new_common_params.post_data = updated_resource_request.request_body;
-  // TODO(shimazu): Set correct base url and history url for a data URL.
 
   mojom::BeginNavigationParamsPtr new_begin_params =
       previous_request_info.begin_params.Clone();