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Renames google_drive_app_util. files to external_app_util. and GetFilesAppDownloadsDirectoryUrl() to  GetFilesAppUrl().
Moves GetFilesAppUrl() inside external_app_util.

Bug: 1052851
Change-Id: I15195179615bba4c891e66443d1518f02eacd4c4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2090416Reviewed-by: Eugene But <eugenebut@chromium.org>
Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Commit-Queue: Ewann Pellé <ewannpv@chromium.org>
Cr-Commit-Position: refs/heads/master@{#747735}