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It made sense to just remove the dwrite namespaces since these headers are
only included in the other dwrite files (and will only ever be), and standard
Chromium namespace usage is "just one namespace per top-level module" anyway.

Bug: 82078
Change-Id: I9f5808da274d649cbfc8fabdf94980caf1de6edd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1815667Reviewed-by: Dominik Röttsches <drott@chromium.org>
Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#698610}