NavigationURLLoaderImpl: Fix GCC build after #580595

Commit bf7722f9 ('Reland "Fixes
ExtensionWebRequestApiTest.WebRequestBlocking with network service"') caused
the GCC build to hit https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84849,
where having base::NoDestructor<T<U>> and passing an initializer list of Us
does not work.

Explicitly create an std::set<string> to pass to base::NoDestructor, just
like we did in https://chromium-review.googlesource.com/944405 before.

Bug: 819294
Change-Id: I8077b39959d8a53daef40bc33f8293f15c597ce0
Reviewed-on: https://chromium-review.googlesource.com/1165360
Reviewed-by: Matt Menke <mmenke@chromium.org>
Reviewed-by: Charlie Harrison <csharrison@chromium.org>
Commit-Queue: Raphael Kubo da Costa (CET) <raphael.kubo.da.costa@intel.com>
Cr-Commit-Position: refs/heads/master@{#581287}
1 file changed