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This CL adds ExtendOpenInFilesSupport to the fieldtrial testing config

Bug: 1117398
Change-Id: I9d52da7c57e101b1e2607b0c9c6e700e9415468c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2454075Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Steven Holte <holte@chromium.org>
Commit-Queue: Ewann Pellé <ewannpv@chromium.org>
Cr-Commit-Position: refs/heads/master@{#815048}