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Service workers load scripts and sub resources. Currently There is only
one URLLoaderFactory type (kServiceWorkerSubResources) for all cases.
However, When ServiceWorkerImportedScriptUpdateCheck is enabled, only
scripts are loaded in browser process during the check. It's necessary
to separate the loader factory into two types.

So add ContentBrowserClient::URLLoaderFactoryType::kServiceWorkerScript.

Change-Id: I41564fba6b4702257324d77c3d9125be747b2ee4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1774051Reviewed-by: Matt Falkenhagen <falken@chromium.org>
Reviewed-by: Makoto Shimazu <shimazu@chromium.org>
Commit-Queue: Ting Shao <ting.shao@intel.com>
Cr-Commit-Position: refs/heads/master@{#691528}