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This CL replaces .mojom.h includes with .mojom-forward.h in some
sub-directories of chrome/browser to reduce the pre-processed size
of header files and shorter build time. The sub-directories are
following,

  - chrome/browser/usb
  - chrome/browser/vr
  - chrome/browser/web_applications

This CL has no behavior changes.

Bug: 1001360
Change-Id: I05e70b987ed0a571aff1680704afeb03e1bab090
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2103827Reviewed-by: Colin Blundell <blundell@chromium.org>
Commit-Queue: Gyuyoung Kim <gyuyoung@igalia.com>
Cr-Commit-Position: refs/heads/master@{#750553}