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kExternalFilesLoadedInWebState flag forced to load all external URL in
WebState which broke the support for chrome://x-callback-url URLs.

This CL enables kExternalFilesLoadedInWebState codepath only for file://
URLs, because WebState can only load file URLs. With this change
ExternalFileController is still not used when
kExternalFilesLoadedInWebState is enabled.

Bug: 923869
Change-Id: Iff438df5f8abb14dc85338acf18a3403fe3acd68
Reviewed-on: https://chromium-review.googlesource.com/c/1432593
Commit-Queue: Peter Lee <pkl@chromium.org>
Auto-Submit: Eugene But <eugenebut@chromium.org>
Reviewed-by: Peter Lee <pkl@chromium.org>
Cr-Commit-Position: refs/heads/master@{#625830}